Methods to differentiate base peak 257 fentanyls: Methacrylfentanyl, cyclopropyl fentanyl, and crotonyl fentanyl

This application note by Cayman Chemical presents a method that has been developed to separate methacrylfentanyl, cyclopropyl fentanyl, and crotonyl fentanyl by gas chromatography–mass spectrometry (GC-MS).