马来酸酐

2-甲基-2-戊烯醛

异丙叉丙酮

4,6-二甲基-2-吡喃酮

(3aS,4R,7R,7aS)-4,6-dimethyl-3a,4,7,7a-tetrahydro-4,7-(epoxymethano)isobenzofuran-1,3,8-trione