DEXTROROTATORY ISOMER OF 6-(5-CHLORO-2-PYRIDYL)-5-(4-METHYL-1-PIPERAZINYL)CARBONYLOXY-7-OXO-6,7- -DIHYDRO-5-H-PYRROLO£3,4-bPYRAZINE, PROCESS OF ITS PREPARATION AND PHARMACEUTICAL COMPOSITION CONTAINING SAID ISOMER

摘要

The present invention relates to the dextrorotatory isomer of 6- (5-chloro-2-pyridyl) -5- (4-methyl-1-piperazinyl-carbonyloxy) -7-oxo-6,7-dihydro-5H-pyrrolo [3,4-] b / pyrazine, a process for its preparation by racemic cleavage and pharmaceutical compositions containing the derivative which are useful as soothing and hypnotic agents.