FLUOROCYTIDINE DERIVATIVES, THEIR PREPARATION AND MEDICAL PREPARATIONS CONTAINING THEM

摘要

derivs. of formula (I), their hydrates and solvates are new. In (I) R1, R2 and R3 = H or a gp. which is easily removed under physiological conditions, at least one of them being other than H. Specifically easily hydrolysed gps. are of formulae R4CO, R5O.CO or R6S.CO; R4 = H, alkyl, cycloalkyl, oxoalkyl, alkenyl, aralkyl or aryl; R5 and R6 = alkyl or aralkyl.