[vintermann]

Still legal for what purposes? Selling for consumption? I doubt it.

When you sell stuff as medicine, food or anything in between, of course it should be on you to prove that it's safe. That's not unreasonable.

Neither is it unreasonable to ask, if you sit there with 100kg of some novel molecule custom ordered from a Chinese lab, what you were planning to use it for. And it'd better not be selling it for consumption.

[failrate]

They are referred to as "research chemicals", so the implication is that they have been synthesizes for e.g. an experiment or animal trial. This is merely puffery to hide the fact that it is a loophole to get technically not yet illegal variants of drugs.