Optically active 5H-pyrrolo[3,4-b]pyrazine derivative, its preparation and pharmaceutical compositions containing it

  • US 6,444,673 B1
  • Filed: 11/28/2000
  • Issued: 09/03/2002
  • Est. Priority Date: 01/17/1991
  • Status: Expired due to Term
First Claim
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1. 6-(5-chloro-2-pyridyl)-5-[(4-methyl-1-piperazinyl)carbonyloxy]-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazine, or a pharmaceutically acceptable salt thereof, in the form of its dextrorotatory isomer and essentially free of its levorotatory isomer.

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