__________ was first synthesized in 1956 and found to be an effective surgical anesthetic, but with serious side effects, including violent behavior

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PCP, or phencyclidine, was first synthesized in 1956 and was initially used as a surgical anesthetic. However, it was found to have serious side effects, including hallucinations and violent behavior, leading to its discontinuation for medical use.

__________ Was First Synthesized in 1956 and Found to Be