Laborit noted that promethazine produced a "euphoric quietude"—a "calm, with a restful and relaxed face." In 1950, the drug company Rhone-Poulenc, picking up on the hunch that it might be useful for psychiatric patients, initiated a major research into phenothiazines, the group of drugs promethazine belongs to. In 1952, when health maintenance organizations and pharmacopoeia oversight boards, which would have vetoed such an "unproven venture," were unheard of, two Parisian psychiatrists, Jean Delay and Pierre Deniker, treated a 57-year-old laborer, Giovanni A., who was diagnosed as having schizophrenia. After 3 weeks of treatment with chlorpromazine, a phenothiazine, Giovanni was discharged "able to have a normal conversation."