abstract |
(57) [Summary] Formula (I): Wherein X 1 is alkyl, sulfonyl or carboxy; X 2 is hydrogen or alkyl; R 1 is arylmethyl or heterocyclylmethyl; R 2 is alkyl, alkenyl, aryl, cycloalkyl or cycloalkenyl And R 3 represents hydrogen, alkyl, alkenyl, alkynyl or aryl]. Are useful in the treatment of diseases mediated by s-CD23. |