The complement system helps or “complements” the ability of antibodies and phagocytic cells to clear pathogens from an organism. It is part of the immune system called the innate immune system that is not adaptable and does not change over the course of an individual's lifetime. The complement system consists of a number of small proteins found in the blood, in general synthesized by the liver, and normally circulating as inactive precursors (pro-proteins). When stimulated by one of several triggers, proteases in the system cleave specific proteins to release cytokines and initiate an amplifying cascade of further cleavages. The end-result of this activation cascade is massive amplification of the response and activation of the cell-killing membrane attack complex. Over 30 proteins and protein fragments make up the complement system. Three biochemical pathways activate the complement system: the classical complement pathway, the alternative complement pathway, and the lectin pathway.


Anti-infection >
Arenavirus Bacterial CMV Enterovirus Filovirus Fungal HBV HCV HIV HSV Influenza Virus Parasite Reverse Transcriptase RSV SARS-CoV
Antibody-drug Conjugate >
ADC Cytotoxin ADC Linker Drug-Linker Conjugates for ADC PROTAC-linker Conjugate for PAC
Apoptosis >
Apoptosis Bcl-2 Family c-Myc Caspase DAPK Ferroptosis IAP MDM-2/p53 PKD RIP kinase Survivin Thymidylate Synthase TNF Receptor
Autophagy >
Autophagy LRRK2 ULK Mitophagy
Cell Cycle/DNA Damage >
Antifolate APC ATM/ATR Aurora Kinase Casein Kinase CDK Checkpoint Kinase (Chk) CRISPR/Cas9 Deubiquitinase DNA Alkylator/Crosslinker DNA-PK DNA/RNA Synthesis Eukaryotic Initiation Factor (eIF) G-quadruplex Haspin Kinase HDAC HSP IRE1 Kinesin LIM Kinase (LIMK) Microtubule/Tubulin Mps1 Nucleoside Antimetabolite/Analog p97 PAK PARP PERK Polo-like Kinase (PLK) PPAR RAD51 ROCK Sirtuin SRPK Telomerase TOPK Topoisomerase Wee1
Cytoskeleton >
Arp2/3 Complex Dynamin Gap Junction Protein Integrin Kinesin Microtubule/Tubulin Mps1 Myosin PAK
Epigenetics >
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GPCR/G Protein >
5-HT Receptor Adenosine Receptor Adenylate Cyclase Adiponectin Receptor Adrenergic Receptor Angiotensin Receptor Bombesin Receptor Bradykinin Receptor Cannabinoid Receptor CaSR CCR CGRP Receptor Cholecystokinin Receptor CRFR CXCR Dopamine Receptor EBI2/GPR183 Endothelin Receptor GHSR Glucagon Receptor Glucocorticoid Receptor GNRH Receptor GPCR19 GPR109A GPR119 GPR120 GPR139 GPR40 GPR55 GPR84 Guanylate Cyclase Histamine Receptor Imidazoline Receptor Leukotriene Receptor LPL Receptor mAChR MCHR1 (GPR24) Melatonin Receptor mGluR Motilin Receptor Neurokinin Receptor Neuropeptide Y Receptor Neurotensin Receptor Opioid Receptor Orexin Receptor (OX Receptor) Oxytocin Receptor P2Y Receptor Prostaglandin Receptor Protease-Activated Receptor (PAR) Ras RGS Protein Sigma Receptor Somatostatin Receptor TSH Receptor Urotensin Receptor Vasopressin Receptor Melanocortin Receptor
Immunology/Inflammation >
Aryl Hydrocarbon Receptor CCR Complement System COX CXCR FLAP Histamine Receptor IFNAR Interleukin Related IRAK MyD88 NO Synthase NOD-like Receptor (NLR) PD-1/PD-L1 PGE synthase Salt-inducible Kinase (SIK) SPHK STING Thrombopoietin Receptor Toll-like Receptor (TLR) Arginase
JAK/STAT Signaling >
EGFR JAK Pim STAT
MAPK/ERK Pathway >
ERK JNK KLF MAP3K MAP4K MAPKAPK2 (MK2) MEK Mixed Lineage Kinase MNK p38 MAPK Raf Ribosomal S6 Kinase (RSK)
Membrane Transporter/Ion Channel >
ATP Synthase BCRP Calcium Channel CFTR Chloride Channel CRAC Channel CRM1 EAAT2 GABA Receptor GlyT HCN Channel iGluR Monoamine Transporter Monocarboxylate Transporter Na+/Ca2+ Exchanger Na+/HCO3- Cotransporter Na+/K+ ATPase nAChR NKCC P-glycoprotein P2X Receptor Potassium Channel Proton Pump SGLT Sodium Channel TRP Channel URAT1
Metabolic Enzyme/Protease >
15-PGDH 5 alpha Reductase 5-Lipoxygenase Acetyl-CoA Carboxylase Acyltransferase Adenosine Deaminase Adenosine Kinase Aldehyde Dehydrogenase (ALDH) Aldose Reductase Aminopeptidase Angiotensin-converting Enzyme (ACE) ATGL ATP Citrate Lyase Carbonic Anhydrase Carboxypeptidase Cathepsin CETP COMT Cytochrome P450 Dipeptidyl Peptidase Dopamine β-hydroxylase E1/E2/E3 Enzyme Elastase Enolase FAAH FABP Factor Xa Farnesyl Transferase Fatty Acid Synthase (FAS) FXR Glucokinase GSNOR Gutathione S-transferase HCV Protease Hexokinase HIF/HIF Prolyl-Hydroxylase HIV Integrase HIV Protease HMG-CoA Reductase (HMGCR) HSP Indoleamine 2,3-Dioxygenase (IDO) Isocitrate Dehydrogenase (IDH) Lactate Dehydrogenase LXR MAGL Mineralocorticoid Receptor Mitochondrial Metabolism MMP Nampt NEDD8-activating Enzyme Neprilysin PAI-1 PDHK PGC-1α Phosphatase Phosphodiesterase (PDE) Phospholipase Procollagen C Proteinase Proteasome Pyruvate Kinase RAR/RXR Renin ROR Ser/Thr Protease SGK Stearoyl-CoA Desaturase (SCD) Thrombin Tryptophan Hydroxylase Tyrosinase Xanthine Oxidase
Neuronal Signaling >
5-HT Receptor AChE Adenosine Kinase Amyloid-β Beta-secretase CaMK CGRP Receptor COMT Dopamine Receptor Dopamine Transporter FAAH GABA Receptor GlyT iGluR Imidazoline Receptor mAChR Melatonin Receptor Monoamine Oxidase nAChR Neurokinin Receptor Opioid Receptor Serotonin Transporter γ-secretase
NF-κB >
NF-κB IKK Keap1-Nrf2 MALT1
PI3K/Akt/mTOR >
Akt AMPK ATM/ATR DNA-PK GSK-3 MELK mTOR PDK-1 PI3K PI4K PIKfyve PTEN
PROTAC >
PROTAC E3 Ligase Ligand-Linker Conjugate Ligand for E3 Ligase PROTAC Linker PROTAC-linker Conjugate for PAC
Protein Tyrosine Kinase/RTK >
Ack1 ALK Bcr-Abl BMX Kinase Btk c-Fms c-Kit c-Met/HGFR Discoidin Domain Receptor DYRK EGFR Ephrin Receptor FAK FGFR FLT3 IGF-1R Insulin Receptor IRAK Itk PDGFR PKA Pyk2 ROS Src Syk TAM Receptor Trk Receptor VEGFR
Stem Cell/Wnt >
Casein Kinase ERK Gli GSK-3 Hedgehog Hippo (MST) JAK Notch Oct3/4 PKA Porcupine ROCK sFRP-1 Smo STAT TGF-beta/Smad Wnt YAP β-catenin γ-secretase
TGF-beta/Smad >
TGF-beta/Smad PKC ROCK TGF-β Receptor
Vitamin D Related >
VD/VDR
Others >
Androgen Receptor Aromatase Estrogen Receptor/ERR Progesterone Receptor Thyroid Hormone Receptor Others

Avdoralimab

Avdoralimab (IPH 5401) is a fully human IgGκ monoclonal antibody that targets the complement C5a receptor 1 (C5aR1) that prevents its binding to C5a. Avdoralimab can be used for complement-driven inflammatory diseases and solid tumours research[1].

  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

ADH-503

ADH-503 ((Z)-Leukadherin-1 choline) is an orally active and allosteric CD11b agonist. ADH-503 leads to the repolarization of tumorassociated macrophages, reduction in the number of tumor-infiltrating immunosuppressive myeloid cells, and enhances dendritic cell responses[1].

  • CAS Number: 2055362-74-6
  • MF: C27H28N2O5S2
  • MW: 524.65
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

NRP1 antagonist 2

NRP1 antagonist 2 (Compound 1) is an NRP1 antagonist[1].

  • CAS Number: 483289-96-9
  • MF: C20H17ClN6OS2
  • MW: 456.97
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Crovalimab

Crovalimab (SKY59; RO7112689) is a novel humanized antibody against C5 in a pH-dependent manner with KDs of 15.2 nM and 16.8 μM at pH 7.4 and 5.8, respectively. Crovalimab binds human FcRn with great affinity (KD: 17 μM at pH 6.0). Crovalimab can block cleavage of C5 by the C5 convertase and inhibite the activity of a C5 variant (p.Arg885His). Crovalimab inhibits C5b-9 formation significantly in all three complement pathways, the classical pathway (CP), lectin pathway (LP), and alternative pathway (AP). Crovalimab has the potential for paroxysmal nocturnal hemoglobinuria (PNH) and complement-mediated diseases research[1][2].

  • Density: N/A
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Citrostadienol

Citrostadienol is a steroid compound with anti-inflammatory and anticomplementary activities. Citrostadienol demonstrates inhibition activities on classical complement pathway (IC50 of 46 nM)[1].

  • CAS Number: 474-40-8
  • MF: C30H50O
  • MW: 426.71700
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

PMX 53

PMX53 (Ac-Phe-cyclo(Orn-Pro-D-Cha-Trp-Arg)) is a potent C5a receptor (CD88) antagonist with IC50 of 20 nM, also is an agonist for Mas-related gene 2 (MrgX2) in human mast cells; PMX-53 (10 nM) inhibited C5a-induced Ca(2+) mobilization in HMC-1 cells, but at higher concentrations (>30 nM) it caused degranulation in LAD2 mast cells, CD34(+) cell-derived mast cells, and RBL-2H3 cells stably expressing MrgX2; inhibits zymosan-, carrageenan-, LPS- and antigen-induced hypernociception in rats.

  • CAS Number: 219639-75-5
  • MF: C47H65N11O7
  • MW: 896.089
  • Catalog: Complement System
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

NDT 9513727

NDT 9513727 is a potent, selective, orally active and competitive inverse agonist of the human C5aR (C5a receptor), with an IC50 of 11.6 nM. NDT 9513727 can be used for the research of human inflammatory diseases[1].

  • CAS Number: 439571-48-9
  • MF: C36H35N3O4
  • MW: 573.68100
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Avacopan

Avacopan (CCX168) is a potent, selective and orally available complement 5a receptor inhibitor with an IC50 of 0.1 nM.

  • CAS Number: 1346623-17-3
  • MF: C33H35F4N3O2
  • MW: 581.64400
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Avacincaptad pegol

Avacincaptad pegol is a C5 complement inhibitor that may reduce inflammation-related retinal pigment epithelium (RPE) damage. Avacincaptad pegol caqn be used for the research of stargardt macular dystrophy (STGD1) and geographic atrophy (GA)[1][2].

  • Density: N/A
  • Boiling Point: N/A
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Pelecopan

Pelecopan (BCX9930) is a potent, selective, orally active inhibitor of complement factor D with an IC50 value of 14.3 nM. Pelecopan can target factor D to prevent both intravascular and extravascular hemolysis in PNH. Pelecopan also be used for other alternative pathway (AP) mediated diseases[1][2].

  • CAS Number: 2378380-49-3
  • MF: C23H19FN2O4
  • MW: 406.41
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

LNP023 hydrochloride

LNP023 hydrochloride is an orally bioavailable, highly potent and highly selective factor B inhibitor. LNP023 shows direct, reversible, and high-affinity binding to human factor B with a KD of 7.9 nM. LNP023 inhibits factor B with an IC50 value of 10 nM[1][2].

  • CAS Number: 1646321-63-2
  • MF: C25H31ClN2O4
  • MW: 458.98
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Sutimlimab

Sutimlimab, a first-in-class complement protein component 1, s subcomponent (C1s) inhibitor, can be used for the research of cold agglutinin disease. C1s is a serine protease which cleaves C4 and C2 to form the C3 convertase[1].

  • Density: N/A
  • Boiling Point: N/A
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  • Flash Point: N/A

Mirococept

Mirococept (APT070) is an antibody targeting to complement system C3b/C4b, as well as a membrane-localizing C3 convertase inhibitor. Mirococept reduces the release of C-peptide and pro-inflammatory cytokines, and reduces the infiltration of inflammatory cells. Mirococept reduces intraislet inflammation, which is beneficial to islet transplantation. Mirococept also inhibits increased intestinal and pulmonary vascular permeability to reduce neutrophil influx[1][2].

  • CAS Number: 507453-82-9
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
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  • Flash Point: N/A

1-Piperidinecarboxamide, 4-[(benzo[b]thien-3-ylcarbonyl)[2-(4-chlorophenyl)ethyl]amino]-N-(2,4-difluorophenyl)-

CP-447697 is a lipophilic C5a receptor antagonist with an IC50 value of 31 nM. CP-447697 can be used for the research of inflammation[1].

  • CAS Number: 1092847-21-6
  • MF: C29H26ClF2N3O2S
  • MW: 554.05
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Lampalizumab

Lampalizumab (RG 7417) is a humanised monoclonal antibody targeting complement Factor D in the alternative complement pathway. Lampalizumab binds an exosite and sterically blocks Factor B access to the active site. Lampalizumab can be used for age-related macular degeneration (AMD) research[1][2].

  • CAS Number: 1278466-20-8
  • MF:
  • MW: 46.96 (kDa)
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

L-156,602

L-156602 is a C5a receptor antagonist. L-156602 inhibits inflammation, and the migration of monocytes and neutrophils to the infiltrating site in mouse inflammatory models. L-156602 suppresses the efferent phase of delayed-type hypersensitivity (DTH)[1][2].

  • CAS Number: 125228-51-5
  • MF: C38H64N8O13
  • MW: 840.96
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Vemircopan

Vemircopan is a complement factor D inhibitor[1].

  • CAS Number: 2086178-00-7
  • MF: C29H28BrN7O3
  • MW: 602.48
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

BCX 1470 (methanesulfonate)

BCX 1470 inhibits the esterolytic activity of factor D (IC50=96 nM) and C1s (IC50=1.6 nM), 3.4- and 200-fold better, respectively, than that of trypsin.IC50 Value: 96 nM (Factor D); 1.6 nM (C1s); 326 nM (Trypsin) [1]Target: Factor D; C1sBCX 1470(Thrombin inhibitor) is serine protease inhibitor.BCX 1470(Thrombin inhibitor) blocks the esterolytic and hemolytic activities of the complement enzymes Cls and factor D in vitro, also blocked development of RPA-induced edema in the rat.

  • CAS Number: 217099-44-0
  • MF: C15H14N2O5S3
  • MW: 398.47700
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: 509.9ºC at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 262.2ºC

C5aR-IN-3

C5aR-IN-3 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-3 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 89)[1].

  • CAS Number: 2761048-50-2
  • MF: C36H40FN5O3
  • MW: 609.73
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

PMX 205

PMX 205 is a potent complement C5a receptor (C5aR; CD88) antagonist.

  • CAS Number: 514814-49-4
  • MF: C45H62N10O6
  • MW: 839.03700
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Ravulizumab

Ravulizumab (ALXN1210) is a humanized monoclonal antibody that specifically binds with high affinity to the human complement protein C5. Ravulizumab can be used for the research of paroxysmal nocturnal hemoglobinuria, atypical hemolytic uremic syndrome, and myasthenia gravis[1].

  • Density: N/A
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Vilobelimab

Vilobelimab (CaCP-29, IFX-1) is a monoclonal anti-C5a antibody to the allergen C5a, a pro-inflammatory complement division product that plays a central role in mediating organ dysfunction. Vilobelimab acts as a C5a inhibitor, inhibiting neutrophil activation, chemotaxis, and reducing inflammatory signalling, and may be used in studies related to sepsis, COVID-19, etc[1].

  • Density: N/A
  • Boiling Point: N/A
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BR103

BR103 is a potent, metabolically stable and highly selective small molecule agonist of complement C3a receptor (C3aR) with EC50 of 22 ± 8  nM; displays high selectivity for C3aR over C5aR; induces paw oedema and mast cell activation in vivo in rats.

  • CAS Number: 1434873-26-3
  • MF: C24H28N6O3
  • MW: 448.527
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Vesencumab

Vesencumab (MNRP-1685A) is IG1 antibody against neuropilin-1 (NRP-1). Vesencumab binds to NRP-1 and prevents the subsequent coupling of NRP-1 to VEGFR-2. Vesencumab has anti-angiogenic and anti-neoplastic activities. Vesencumab can be used in the research of metastatic solid tumors, including ovarian cancer[1][2].

  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

BCX 1470

BCX 1470 inhibits the esterolytic activity of factor D (IC50=96 nM) and C1s (IC50=1.6 nM), 3.4- and 200-fold better, respectively, than that of trypsin.IC50 Value: 96 nM (Factor D); 1.6 nM (C1s); 326 nM (Trypsin) [1]Target: Factor D; C1sBCX 1470(Thrombin inhibitor) is serine protease inhibitor.BCX 1470(Thrombin inhibitor) blocks the esterolytic and hemolytic activities of the complement enzymes Cls and factor D in vitro, also blocked development of RPA-induced edema in the rat.

  • CAS Number: 217099-43-9
  • MF: C14H10N2O2S2
  • MW: 302.371
  • Catalog: Complement System
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: 509.9±58.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 262.2±32.3 °C

3-Phenoxybenzaldehyde

3-Phenoxybenzaldehyde has weak complement classical pathway inhibition and hemolytic activity[1].

  • CAS Number: 39515-51-0
  • MF: C13H10O2
  • MW: 198.22
  • Catalog: Complement System
  • Density: 1.2±0.1 g/cm3
  • Boiling Point: 392.4±0.0 °C at 760 mmHg
  • Melting Point: 13 °C
  • Flash Point: 156.1±13.9 °C

Cemdisiran

Cemdisiran is an N-acetylgalactosamine (GalNAc) conjugated siRNA for the treatment of complement-mediated diseases by suppressing liver production of complement 5 (C5) protein.

  • CAS Number: 1436858-07-9
  • MF: C78H140N11O34P
  • MW: 1806.97
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Lipoteichoic Acid

Lipoteichoic acid, a cell wall component of Staphylococcus aureus, activates the complement system via C3 induction and CD55 inhibition[1].

  • CAS Number: 56411-57-5
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
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  • Flash Point: N/A

Compstatin control peptide

Compstatin control peptide is a complement inhibitor.

  • CAS Number: 301544-78-5
  • MF: C66H101N23O17
  • MW: 1488.652
  • Catalog: Complement System
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Dexamethasone-4,6α,21,21-d4

Dexamethasone-4,6α,21,21-d4 is the deuterium labeled Dexamethasone-4,6α,21,21. Dexamethasone (Hexadecadrol) is a glucocorticoid receptor agonist. Dexamethasone also significantly decreases CD11b, CD18, and CD62L expression on neutrophils, and CD11b and CD18 expression on monocytes. Dexamethasone is highly effective in the control of COVID-19 infection. Dexamethasone inhibits production of exosomes containing inflammatory microRNA-155 in lipopolysaccharide-induced macrophage inflammatory responses.

  • CAS Number: 2483831-63-4
  • MF: C22H25D4FO5
  • MW: 396.49
  • Catalog: Bacterial
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A