----- 卡痛和其他药物:从非鸦片而来的化学和药理学类鸦片药物
Opioids such as morphine, codeine, and oxycodone are extracts or analogs isolated from a single source: the opium poppy. For a long time, it was believed to be nature's only source of opioids. But it now appears that biological diversity has evolved an alternative source of opioid compounds-those derived from the plant Mitragyna speciosa. This plan
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