(1S,2S,3R,6S)-3-Acetoxy-6-(4-chloro-phenylamino)-cyclohex-4-ene-1,2-dicarboxylic acid di-tert-butyl ester

(1S,4R,5R,6S)-2-Oxa-3-aza-bicyclo[2.2.2]oct-7-ene-5,6-dicarboxylic acid dimethyl ester; hydrochloride

c-2-Acetoxy-r-1-(p-chloranilino)c-3,4-epoxycyclohexen-t-5,c-6-dicarbonsaeure-di-tert-butylester

(1S,4R,5R,6S)-2-Oxa-3-aza-bicyclo[2.2.2]oct-7-ene-5,6-dicarboxylic acid diethyl ester; hydrochloride