| abstract |
Triterpene derivatives of the formula (I): <CHEM> wherein R<1> is hydrogen or metabolic ester residue; and R<2> is hydrogen or -R<3>-R<4> wherein R<3> is -SO3-, -CH2COO-, -COCOO-, or -COR<5>COO- (R<5> is lower alkylene or lower alkenylene), and R<4> is hydrogen or metabolic ester residue, or pharmaceutically acceptable salts thereof, have anti-endothelin activities and are useful in prophylaxis and treatment of diseases caused by excessive secretion of endothelin. |