LSD drug. Molecular model of lysergic acid diethylamide (C20.H25.N3.O), also known as lysergide and more commonly called LSD. This psychedelic drug has psychological effects that include altered thinking processes, hallucinations, synaesthesia, an altered sense of time, and spiritual experiences. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue) and oxygen (red). Illustration.