3-丁基-2-甲基-4-氧代-2-环戊烯-1-甲酰胺

3-butyl-2-methyl-4-oxo-cyclopent-2-enecarboxylic acid ethyl ester

hexadeca-6,10-diyne-8,9-diol

4-(2-呋喃基)-3-丁烯-2-酮

4,7-dioxooctanoic acid