I am taking a medicinal chemistry course, and we have a term paper on which we need to pick a drug and wrote things like bioassay, lead compound, lead modification, pharmacodynamics/kinetics, prodrugs, and things like that. At the moment I chose Zolpidem, but I just can't find information about the lead compound and lead modification...everything else is pretty much readily available. I have tried several drugs, and I couldn't find any of the lead. Is it the problem of my searching skill? I'm using the SciFinder. Thank you folx. Easy-to-write drugs recommendation is also welcomed!