You could easily argue that everything that ever was or will be is natural, not really sure why the word is still used to describe products.
Hydrogen, oxygen, and nitrogen are natural. But this arrangement of the atoms does not occur unless humans want it to. https://en.wikipedia.org/wiki/Tramadol
If a beehive or beaver dam is considered natural then so is the empire state building, all three were created by animals native to this planet.