By that standard pretty much everything is “partially” natural. You’re almost always going to have at least one starting material that was derived from a plant or other natural product.
Lysergic acid diethylamide, commonly known as LSD (from German Lysergsäurediethylamid) and by the nicknames acid and Lucy, is a semisynthetic psychedelic drug derived from ergot, known for its potent psychological effects.
Is LSD not considered a synthetic?
partially
By that standard pretty much everything is “partially” natural. You’re almost always going to have at least one starting material that was derived from a plant or other natural product.
Bring that up with chemistry, it’s their term.
https://en.wikipedia.org/wiki/Semisynthesis