Uridine derivative and process for preparing the same.

摘要

A novel uridine derivative of the formula (I): wherein R<1> is acyloxy, R<2> is hydrogen, acyloxy, etc., R<3> is aralkyloxy, acyloxy, etc., R<4> is hydrogen, acyloxy, etc., R is hydrogen or a lower alkyl, and Y is fluorine or trifluoromethyl, and a process for preparing the same are provided. The uridine derivative (I) of the present invention exhibits an excellent anti-tumor activity in vivo.