. "103611" . . . . "4-Fluorophenibut" . . "4-Fluoroisobutyryl fentanyl" . "52237-19-1" . . "4-F-phenibut" . . "4-Fluorophenibut" . . . . . . . . . . . "6DAU7M5P3D" . . "4-Flurophenibut" . . . . . . .