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Chemical structures. A) N‐phenyl‐1‐(2‐phenylethyl)piperidin‐4‐amine (synthetic precursor); B) N‐phenyl‐N‐[1‐(2‐phenethyl)piperidin‐4‐yl]propanamide (Fentanyl); C) N‐phenyl‐N‐[1‐(2‐ phenethyl)piperidin‐4‐yl]prop‐2‐enamide (synonym: acrylfentanyl).
