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[1]. Slaughter DE, et al. Preparation of N-[1'-(6-cyano-4-hydroxy-1,2,3,4-tetrahydro-2(R)-naphthalenyl-3,4-dihydro-4(R)-hydroxyspiro[2H-1-benzopyran-2,4'-piperidin-6-yl]methanesulfonamide as an antiarrhythmic agent.. World Intellectual Property Organization, WO9607411A1.1996-03-14.