(2R,3aR,4R,8aS)-4,8-dimethyl-2-(prop-1-en-2-yl)-1,2,3,3a,4,5,6,8a-octahydroazulen-4-ol

4-(乙酰氧基)-2-环戊烯-1-酮

9-Oxobicyclo[5.3.0]decan-2,6-dicarbonsaeure-dimethylester

dimethyl 2-(1-ethoxy-1-oxopropan-2-ylidene)decahydroazulene-4,8-dicarboxylate

9-Oxobicyclo[5.3.0]decan-2,2,6,6-tetracarbonsaeure-tetramethylester