... lactone ring five membered 五元内酯环 member unsaturated lactone ring 五元不饱和内酯环 large ring lactone 大环内酯 ...
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member unsaturated lactone ring
成员不饱和内酯环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Its molecular structure is made up of a five member, unsaturated lactone ring with two hydroxyl groups.
其分子结构是由五个成员国，不饱和内酯环两个羟基。
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