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四角风车子干燥叶(2.65kg)用甲醇提取,甲醇提取物取400g上硅胶柱,得到11部分。部分3～9经分离得到15种新的环菠
The dry leaf (2.65 kg) was extracted with methanol, and 400 g of the methanol extract was applied to a silica gel column to obtain 11 parts. Fractions 3-9 were isolated to give 15 new ring-rings