(5S)-6-(5-Chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo(3,4-b)pyrazin-5-yl 4-methylpiperazine-1-carboxylate (S)-Zopiclone (plus)-Zopiclone 1-Piperazinecarboxylic acid, 4-methyl-, (5S)-6-(5-chloro-2-pyridinyl)-6,7-dihydro-7-oxo-5H-pyrrolo(3,4-b)pyrazin-5-yl ester 138729-47-2 Estorra Eszopiclone Eszopiclone [USAN:INN] Lunesta