4,6-dioxo-6-(pyridin-3-yl)hexanoic acid

4-[6-[[6-(1-Butoxyvinyl)-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl]amino]pyridin-3-yl]piperazine-1-carboxylic acid tert-butyl ester

4,6-dioxo-6-phenyl-hexanoic acid ethyl ester

(5,5-diethyl-4,6-dioxo-1H-pyridin-3-yl)methyl 2-hydroxybenzoate

(5,5-diethyl-4,6-dioxo-1H-pyridin-3-yl)methyl 2-hydroxy-2,2-diphenylacetate

(5,5-diethyl-4,6-dioxo-1H-pyridin-3-yl)methyl 2-acetyloxybenzoate

(5,5-diethyl-4,6-dioxo-1H-pyridin-3-yl)methyl 3,4,5-trimethoxybenzoate