In the case of substances with very low concentrations in biological product, liquid or gas chromatography with tandem mass spectrometry approaches have the necessary sensitivity. From the discussed scenario, a liquid chromatograph with a triple quadrupole mass spectrometer working in many reaction monitoring (MRM) manner was used for NPS screening. https://5fmdmb220110762.blogsuperapp.com/31131502/a-review-of-5f-mdmb-2201