the plant from which it comes, minus all added chemicals.

what is the high, what are the risks?

i am a naturalist all the way, i will do any drug that is not man made, and not immediately and potentially dangerous.
There shouldn't be any added chemicals, that is just the way the law makes it. The cocaine in erythroxylum coca is the same cocaine that is on the streets except that it is much more concentrated. It has not been synthesized but extracted from nature, such as how some people like to make extracts of marijuana called hash.
You cannot judge the dangers of a substance based soley upon whether it occurs in nature or is 'synthetic', it is much more complex than that.