2-(1-ethoxycarbonyl-2-oxocyclopentyl)acetic acid

(1S,2S)-(-)-2-氨基-1-环戊烷羧酸

(1S,2R)-2-氨基环戊烷甲酸

1,4-dioxaspiro[4.4]nonane-9-carboxylic acid

(2E)-2-(苯基亚肼基)己二酸