“…2019 ATR-FTIR method for fast qualitative analysis of 13 precursor chemical [ 1077 ]; 2020 quick detection and quantification of Acetic anhydride in air, the key chemical used as acetylation agent in producing the illegal drugs heroin and methaqualone using photoionization detection and IMS [ 1078 ]; identification and characterization of chemically masked derivatives of pseudoephedrine, ephedrine, MA, and MDMA using NMR, GC-MS, FTIR, high-resolution LC-MS/MS to provide updated compound spectral libraries [ 1079 ]; study on the illicit production of ephedrine/pseudoephedrine as precursors for MA [ 1080 ]; 2021 sensor for detecting benzyl methyl ketone, a precursor for amphetamine production [ 1081 ]; UPLC method for the separation and detection of 2,6-dimethylaniline and isomers (precursors used in the synthesis of many classes of drugs) [ 1082 ]; sensor for the detection of benzyl methyl ketone a precursor for AMP [ 1083 ].…”