2-((3aR,4S,5aS,8R,9aS,9bS)-4-((R)-1,2-二羟乙基)八氢螺环[[1,3]二氧代[4,5-d]吡喃[3,2-b]吡喃-2,1'-环己烷]-8-基)乙酸甲酯 [ 871360-12-2 ]