Thebaine is an opioid alkaloid also called as codeine methyl enol ether. Although it is a minor constituent of opium i.e. thebaine is chemically similar to codeine and morphine, thebaine has stimulatory effects instead of depressant effects. Thebaine is white crystalline substance, which is slightly soluble in water. It is more lethal substance as compared to morphine therefore it said to be poisonous alkaloid.

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