| abstract |
A novel uridine derivative of the formula (I):n n wherein R¹ is acyloxy, R² is hydrogen, acyloxy, etc., R³ is aralkyloxy, acyloxy, etc., R⁴ 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 . |