Structures of the 23 benzodiazepines and benzodiazepine-like compounds that we evaluated grouped by class. (A) 5-arl-1,4-benzodiazepines, (B) diazolo-benzodiazepines and triazolo-benzodiazepines, (C) benzodiazepines antagonists, and (D) compounds that do not belong to the three previous groups.