(4aR,8aS)-2,3,4a,8a-tetramethyl-5,8-dihydronaphthalene-1,4-dione

4-乙烯氮杂啶-2-酮

3-eth-(E)-ylidene-6-vinyl-tetrahydro-pyran-2-one

3-ethyl-5-propylidenefuran-2-one

(Z)-3-ethylidene-5-((E)-prop-1-en-1-yl)dihydrofuran-2(3H)-one