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