二碳酸二叔丁酯

乙基1-氨基-3-环戊烯-1-羧酸酯

(2R,5S)-5-allyl-3,6-diethoxy-2,5-dihydro-2-isopropylpyrazine

(2R)-5,5-diallyl-3,6-diethoxy-2,5-dihydro-2-isopropylpyrazine

1-{[1-(4-Bromo-phenyl)-meth-(E)-ylidene]-amino}-cyclopent-3-enecarboxylic acid ethyl ester