(S)-6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate;(+)-(5S)-6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl-4-methylpiperazine-1-carboxylate;(S)-4-Methylpiperazine-1-carboxylic acid 6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl ester;(S)-6-(5-Chloro-2-pyridinyl)- 7-oxo- 6,7-dihydro- 5H-pyrrolo[3,4-b]pyrazin-5-yl- 4-methyl- 1-piperazinecarboxylate;[(7S)-6-(5-chloranylpyridin-2-yl)-5-oxidanylidene-7H-pyrrolo[3,4-b]pyrazin-7-yl] 4-methylpiperazine-1-carboxylate;1-Piperazinecarobxylic acid,4-methyl-,(5S)-6-(5-chloro-2-pyridinyl)-6,7-dihydro-7-oxo-5H-pyrrolo[3,4-b]pyrazin-5-yl ester;4-methyl-1-piperazinecarboxylic acid [(7S)-6-(5-chloro-2-pyridinyl)-5-oxo-7H-pyrrolo[3,4-b]pyrazin-7-yl] ester;(S)-(+)-Zopiclone;Eszopiclone ( S-Zopiclone);Zopiclone s-form;Lunivia;(S)-Eszopiclone;(plus)-Zopiclone