The structures of 2 alkylformyl indoles synthetic cannabinoids,ADB-4en-PINACA and MDMB-4en-PINACA,were distinguished by infrared spectrometry and gas chromatography-mass spectrometry,and the 2 compounds in actual tobacco samples were identified.It was shown that the characteristic peaks of ADB-4en-PINACA were located at 3 354.1,3 208.0,682.3 cm-1,with retention time of 19.098 min,parent ion of m/z 342.2,and main daughter ions of m/z 213.1,241.2.The characteristic peaks of MDMB-4en-PINACA were located at 3 411.8,1 725.4 cm-1,with retention time of 13.238 min,parent ion of m/z 357.2,and main daughter ions of m/z 213.1,270.1.The reason for the difference between the 2 compounds was that the terminal group of ADB-4en-PINACA was an amide group,while the terminal group of MDMB-4en-PINACA was an ester group.Gas chromatography-mass spectrometry was applied to analysis of samples suspected to contain ADB-4en-PINACA and MDMB-4en-PINACA,and mass spectrometry characteristic peaks obtained were basically consistent with those of the standards.
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