桦木脑二乙酸

(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13bR)-3a-(hydroxymethyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-ol

醋酸

吡啶