C2a-β-H ketone 6 was synthesized from the exo-IMDA-additive 4 with the aid of singlet oxygen, and ring E of hainanolide......

滇南红厚壳叶经甲醇浸提并浓缩得浸膏,提取浸膏再用石油醚萃取.石油醚溶解部位经硅胶柱层析,石油醚-乙酸乙酯作为洗脱剂梯度洗脱,......