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In addition, because of the significant structural homology between A

Particles: Floating specks or fibers mean contamination

This distinction is required on the labels of research chemicals, and is what exempts them from regulation under parts 100-740 in Title 21 of the code of Federal Regulations (21CFR)
Neurosci Biobehav Rev 23(4):539553 Helmlin HJ, Bracher K, Bourquin D, Vonlanthen D, Brenneisen R (1996) Analysis of 3,4-methylenedioxymethamphetamine (MDMA) and its metabolites in plasma and urine by HPLC-DAD and GC-MS
