(2'R,4aR,4bS,6aS,7aS,8aS,8bS,8cR,9S)-9-(氯甲基)-4a,6a-二甲基-4,4a,4b,5,6,6a,8,8a,8b,8c,9,10-十二氢-2H,3'H-螺环[ , >95% (HPLC)