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Letter to the Editor regarding: Vohlken BA, Layton SM. Instrumental Separation of 3,4-Methylenedioxyamphetamine (MDA) from 1-(3,4-Methylenedioxyphenyl)-2-propanol, a Co-Eluting Compound. Microgram Journal 2003(1-2):32. Sir: Some clarifications on the article by authors Vohlken and Layton. The peak annotated as an unknown “A4” is almost certainly di-[1-(3,4-methylenedioxyphenyl-2-propyl)]amine, the dimer of MDA. There is an article in the April, 1985 issue of the Journal of Forensic Sciences about a similar dimer being produced during the synthesis of amphetamine. The behavior of this compound is unusual in that the GC/MS suggests that you have a low molecular weight compound at a long retention time, when in reality you are looking at only half of the molecule. The actual molecular weight is 340 or 341. This compound was synthesized at this laboratory about 15 years ago. Also of note, similar tablets (white, Rolex logo) are shown on the website dancesafe.org and described as containing MDA/MDMA and another, unidentified substance. We had a submission of similar tablets (400) in September, 2001 from the Detroit, Michigan area. Peter Ausili
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