庚二酸二乙酯

环戊二烯

2-hydroxymethyl-6-hydroxycyclohexa-2,4-dienone

7-(二羟基甲亚基)环庚并-3,5-二烯-1,2-二酮

2-cyclooctyloxycyclohepta-2,4,6-trien-1-one