1,4,8-trioxaspiro[4.5]decane

3,5-bis[(4-methoxyphenyl)methylidene]oxan-4-one

4-phenyloxan-4-ol

4-cyclopenta-2,4-dien-1-ylideneoxane

(R)-3-甲氧基二氢-2H-吡喃-4(3H)-酮