meso-cyclopent-4-ene-1,3-dicarboxylic acid

2,5-降冰片二烯

乙酸酐

(1S,4R)-4-氨基-环戊-2-烯基-1-甲酸甲酯盐酸盐

(-)-(1S,4r)-4-氨基环戊烯-2-羧酸