3-methyl-2-(2-pentynyl)-2-cyclopentenone

(Z)-十一碳-8-烯-2,5-二酮

methyl (Z)-2-[4-[(diethoxyphosphoryl)oxy]-1-oxo-4-pentenyl]-4-heptenoate

1-methyl-2-pent-2-enyl-cyclopent-2-enol

1-溴-2-戊炔