(S)-6-aminohexahydro-2,2-dimethyl-7-oxo-1H-azepine-1-acetic acid ethyl ester

(S)-hexahydro-6-phthalimido-2,2-dimethyl-2H-azepin-7-one

(S)-hexahydro-7,7-dimethyl-3-[(triphenylmethyl)amino]-2H-azepin-2-one

(S)-Hexahydro-6-[(triphenylmethyl)amino]-2,2-dimethyl-7-oxo-1H-azepine-1-acetic acid, ethyl ester