Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more. Search chemicals by name, molecular formula, structure, and other identifiers. This clearly demonstrates the danger in consuming substances bought on the internet, as both identity of the substance and its purity are missing. PubChem is the world's largest collection of freely accessible chemical information. There was no matching between the label and the active ingredient contained in the dispatched bags. The 7 powders were 4-chloro-α-pyrrolidinopentiophenone, dibutylone, 4-chloroethcathinone, 4-fluoro-α-pyrrolidinohexanophenone, 3,4-methylenedioxy-N-benzylcathinone, 3-methoxy-phencyclidine and α-pyrrolidinopropiophenone, with purity between 50.8 and 89.5%. The analytical strategy and the performance of NMR are developed in this article. It is therefore necessary to use another method, such as NMR spectroscopy, to discriminate the species. In addition to the difficulties associated with molecule characterization (identification, quantification, purity), analytical methods used routinely, such as LC-MS/MS, are not always sufficient to firmly identify NPS, for example in case of positional isomers. Some are excessively expensive, and some, even, do not exist in the catalogue of referenced suppliers. However, it is difficult to obtain and purchase the reference standards of all substances. The identification of these substances requires the development of a specific, quality and comprehensive method. 22 Based upon its structural similarity to 1. aureus, but has been shown to have antimicrobial activity against Streptococcus mutans and Fusobacterium nucleatum. 5,21 Compound 8 has not previously been evaluated for biological activity against S. The authors describe the identification of 7 powders, supposed to be NPS, involved in a complex toxicological fatal case. Compounds 13 and 5 are known efflux pump inhibitors, as demonstrated in several previous studies.