Zopiclone Pharmaceutical Intermediates II CAS 43200-81-3 Intermediate II of Eszopiclone Pharmaceutical Intermediate II of Zopiclone Chemical Name:    6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one CAS:    43200-81-3 MF:    C11H7ClN4O2 MW:    262.65 EINECS:    256-139-4 Chemical Properties: Light Yellow Crystalline Powder Melting point: 240.5-241.50C Product Categories: Aromatics Compounds;Aromatics;Heterocycles;Intermediates & Fine Chemicals;Pharmaceuticals Uses: Eszopiclone intermediate, Eszopiclone Impurity B.   Product name Pharmaceutical Intermediates II of Zopiclone 6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one CAS CAS No. 43200-81-3 Outer Packing …