顺式-1,2-二羟甲基乙烯

丁二烯

3-(4-hydroxy-2-butenyl)-2,4-pentadione

ethyl 1-acetyl-2-ethenylcyclopropane-1-carboxylate

1-methyl-1,3-bis(trimethylsilyloxy)buta-1,3-diene