Disclosed are a central nervous system depressant which comprises a 1-amino-5-halogenouracil represented by the formula ##STR1## wherein X represents a halogen atom, or a pharmaceutically acceptable salt thereof as an active ingredient; a 1-amino-5-halogenouracil represented by the formula ##STR2## wherein X' represents chlorine, bromine or iodine, or a salt thereof; and a process for preparing a 1-amino-5-halogenouracil represented by the above shown formula [I] from a pyrimidine derivative represented by the formula ##STR3## wherein X represents a halogen atom and R represents a protective group.
揭示了一种中枢神经系统
抑制剂,包括一种由式##STR1##所代表的1-
氨基-5-卤代尿
嘧啶,其中X代表卤素原子,或其药用可接受的盐作为活性成分;一种由式##STR2##所代表的1-
氨基-5-卤代尿
嘧啶,其中X'代表
氯、
溴或
碘,或其盐;以及一种从式##STR3##所代表的
嘧啶衍
生物制备上述所示式[I]的1-
氨基-5-卤代尿
嘧啶的方法,其中X代表卤素原子,R代表保护基。