最佳答案
回答者:网友
O1C([H])=C(C2C([H])=C([H])C(=C([H])C=2[H])OC(C([H])([H])[H])=O)C(C2C([H])=C([H])C(=C([H])C1=2)OC(C([H])([H])[H])=O)=O