(4,6-二甲基-2-嘧啶基)乙腈

1-(2-甲基-1-环戊烯基)乙酮

1-[2-methyl-2-cyclopenten-1-yl]ethanone

2-Acetyl-1-methyl-1-acetoxycyclopentane

8-O-Acetylrifamycin S