Structure:

Zolpidem Tartrate	99294-93-6
Zolpidem	82626-48-0
6-methyl-2-(4-methylphenyl)imidazo[1,2-a]-pyridine-3-acetic acid (Zolpidic acid)	189005-44-5
6-methyl-2-(4-methylphenyl)imidazo[1,2-a]-pyridine-3-acetate, methyl ester	258273-50-6