I want to readdress this. THC is not an alkaloid, it's a terpenoid, also Salvinorin A is not an alkaloid. Both of these are very potent psychoactives, but of course different from mescaline and the rest. I bring this up because often it’s assumed that psychedelics must be alkaloids, and this is just not the case. Many people consider cannabis and salvia to be psychedelics and neither are active because of alkaloids. Some people even consider salvia to be more hallucinogenic than mescaline. Of course this is almost an “apples and oranges” comparison. I only bring it up because it shows that non-alkaloid psychedelics do exist. These work on different systems from mescaline, but still, they are very active.