Zolpidem, also known as Ambien, is a hypnotic drug that was initially L-(+)-tartrate (2:1) / Zolpidem hemitartrate / Zolpidem L-(+)-hemitartrate; External IDs Monoisotopic: 764.35336253; Chemical Formula: C42H48N6O8; InChI Key cialiso.com buy cialis non prescription