Figure 1.
Chemical structures of heroin, morphine, fentanyl, N-phenyl-N-[1-(2-phenylethyl)-4-piperidinyl]-2-furamide (furanylfentanyl) and 3,4-dichloro-N-[(1R,2R)-2-(dimethylamino)cyclohexyl]-N-methylbenzamide (U-47700).
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