Triterpene derivatives of the formula (I): ##STR1## wherein R.sup.1 is hydrogen or metabolic ester residue; and R.sup.2 is hydrogen or --R.sup.3 --R.sup.4 wherein R.sup.3 is --SO.sub.3 --, --CH.sub.2 COO--, --COCOO--, or --COR.sup.5 COO-- (R.sup.5 is lower alkylene or lower alkenylene), and R.sup.4 is hydrogen or metabolic ester residue or a pharmaceutically acceptable salt thereof, which have anti-endothelin activities and are useful in prophylaxis and treatment of diseases caused by excessive secretion of endothelin.
公式(I)的三萜衍
生物:##STR1## 其中R.sup.1是氢或代谢酯残基;R.sup.2是氢或--R.sup.3--R.sup.4,其中,R.sup.3是--SO.sub.3--,--CH.sub.2 COO--,--COCOO--或--COR.sup.5COO--(R.sup.5是较低的烷基或较低的烯基),R.sup.4是氢或代谢酯残基或其药学上可接受的盐,具有抗内皮素活性,并且在预防和治疗由内皮素过度分泌引起的疾病方面是有用的。