Natural products are one of the important sources for the discovery of new drugs.Betulinic acid(BA),a pentacyclic triter......

为寻找由氟喹诺酮抗菌活性到抗肿瘤活性转化的有效途径,用均三唑和(口恶)二唑分别作为培氟沙星C-3羧基的等排体和修饰基,设计合成......