Thanks Rhodium, that was an excellent response, thanks for the Rfs too. A FOAF says the iodination procedure detailed on your page is a good procedure for 2,5-DMA, but it is best done under red-light or in the dark.
Yellium, if somebody is taking 3mg of a compound, how comfortable is it to know that maybe 20% of it is something else (although inactive)? If someone wants to take a 3mg dose, they take 3,5mg instead to compensate for impurities? YUCK!!
Sorry, but SWIM doesn't understand how bees go so far to make their compounds, then settle for impurties in the final product.