Rohypnol drug. Molecular model of the drug flunitrazepam (C16.H12.F.N3.O3), commonly known as Rohypnol. This is an intermediate-acting benzodiazepine, prescribed for the treatment of severe insomnia. Widely reported instances of its use include cases of date rape drugging. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and fluorine (cyan).