Method for providing blood levels of eszopiclone with maleate salts

摘要

Maleate salts of (6-(5-chloro-2-pyridyl)-5-[(4-methyl-1-piperazinyl)carbonyloxy]-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazine) are provided.; The salts are useful to provide blood levels of eszopiclone that are independent of fasting state.