上游原料
3,3-dimethyldihydro-2,5-furandione(1R,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-hydroxy-1-isopropenyl-5a,5b,8,8,11a-pentamethylicosahydro-3aH-cyclopenta[a]chrysene-3a-carboxylic acid(1R,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-[(3-carboxy-2,2-dimethylpropanoyl)oxy]-1-isopropenyl-5a,5b,8,8,11a-pentamethylicosahydro-3aH-cyclopenta[a]chrysene-3a-carboxylic acid
