2-amino-5,6-dihydro-4H-1,3-thiazine-4-carboxylic acid

2,5-dihydroxy-1,3,3a,4,6,6a-hexahydropentalene-2,5-dicarbonitrile

丁-2,3-二烯腈

N-苄氧羰基-4-氨基丁酸

3,4-O-isopropylidene-2-C-methyl-D-arabinono-1,5-lactone