trans-(7S,8S)-1,4-dithiaspiro[4.4]nonane-7,8-dicarboxylic acid bis(methyl ester)

N-(tert-butyloxycarbonyl)-trans-(7S,8S)-1,4-dithiaspiro[4.4]nonane-7-amino-8-carboxylic acid methyl ester

(1S,2S)-(-)-2-氨基-1-环戊烷羧酸