if yuremamine is so sensitive to heat and acid, why does it not get broken down in the warm, acidic human stomach?

Maybe part of it does, but maybe in the meanwhile, at least part of it already acts as a MAOI and lets DMT be absorbed... Who knows. The only paper on yuremamine so far was a structure characterization, there was no pharmacological studies so at the moment it's still a mistery. At least I think so