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Narceine is an opium alkaloid produced by the Papaver somniferum (opium poppy) plant. It is a bitter, crystalline compound with narcotic effects. It was formerly used as a substitute for morphine. Its name is derived from the Greek νάρκη (nárkē), meaning numbness, and the postfix -ine referring to an alkaloid.
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Narceine Wikipedia(Text) CC BY-SA