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Answer :

Answer:

Ketamine is derived from phencyclidine, which was a problematic and unstable anesthetic for humans synthesized in 1956. In particular, it was too long-lasting and produced a prolonged emergence delirium.

Explanation:

Answer:

Ketamine is derived from phencyclidine, which was a problematic and unstable anesthetic for humans synthesized in 1956. In particular, it was too long-lasting and produced a prolonged emergence delirium.

Explanation: