... pentacyclic compound 五环化合物 pentacyclic flower 五轮花 pentacyclic triterpane 五环三萜烷 ...
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Ursolic acid, a pentacyclic triterpene compound, naturally occurs in a large variety of plants, has attracted considerable interest owing to its significant biological activities.
熊果酸属于五环三萜类化合物，广泛存在于天然植物中，具有多种显著的药理活性。
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