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... LFENTANYL ... (4 elements) ALFENTANYL · ALPHAMETHYLFENTANYL · METYLFENTANYL · SULFENTANYL ... YLFENTANY ... (2 elements) ALPHAMETHYLFENTANYL · METYLFENTANYL | |
... ALPHAMETHYLFENTANYL ... (1 element) ALPHAMETHYLFENTANYL ... METYLFENTANYL ... (1 element) METYLFENTANYL |