What "other alkaloids" are you interested in?
If you check
this out, you'll see that contrary to popular belief, in general other alkaloids are only present sometimes and in very small to trace quantities in T. pachanoi, peruvianus and bridgesii.
That being said, I once tested a FASA'd extract that did have traces of DMPEA, so at least that one does seem to come across if its there in the first place.