(3S,6'S)-2,2,2-trichloroethyl spiro
(5R)-3,3-dimethyl-6c-(4-nitro-benzoyl)-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid 2,2,2-trichloro-ethyl ester
(S)-2,2-dimethyl-6-(4-nitro-benzoyl)-7-oxo-2,3,4,7-tetrahydro-[1,4]thiazepine-3-carboxylic acid 2,2,2-trichloro-ethyl ester
(S)-6-[anilino-(4-nitro-phenyl)-methylene]-2,2-dimethyl-7-oxo-2,3,6,7-tetrahydro-[1,4]thiazepine-3-carboxylic acid 2,2,2-trichloro-ethyl ester
(S)-6-[(4-methoxy-anilino)-phenyl-methylene]-2,2-dimethyl-7-oxo-2,3,6,7-tetrahydro-[1,4]thiazepine-3-carboxylic acid 2,2,2-trichloro-ethyl ester