If you've bought it on "the street" you've not bought synthed DMT anymore than you've ever had synthed mescaline. It can be done, but it isn't done viably for profit. Maybe you'd had it, but you wouldn't know it if you had or not most likely.
So here's some quotes which argue for that which you so vehemently deny...
"N,N-dimethyltryptamine, or DMT, is an illegal, psychedelic tryptamine compound found in the human body and at least
~60 species of plants worldwide. Rick Strassman, MD, described it as "the first
endogenous human psychedelic" in
DMT: The Spirit Molecule (2000), and in
an interview in 2011 said that DMT "seems to actually be a necessary component of normal brain function."
http://www.vice.com/read/dmt-you-cannot-imagine-a-stranger-drug-or-a-stranger-experience-365
http://www.neurosoup.com/dmt/dmt-plants/
https://psychonautwiki.org/wiki/DMT
https://erowid.org/chemicals/dmt/dmt.shtml
https://drugs-forum.com/forum/showthread.php?t=8680
http://www.dmtsite.com/dmt/information/sources.html
Also, you claimed that "DMT isn't simply some of what's in it, in the same way that flour isn't a pan of brownies" which I can only presume is an ass-backwards interpretation of an ayahuasca brew...
Matey, nobody is synthing anything that can be produced without excessive bother via organic sources. The rate of return is absolutely terrible.