<unk> s are<unk>  substances used by scientists for medical and scientific<unk>  purposes. One characteristic of a<unk>  is that it is for laboratory<unk>  use only; a<unk>  is not intended for human or veterinary use. This distinction is required on the labels of<unk> s, and is what exempts them from regulation under parts 100-740 in Title 21 of the Code of Federal Regulations (21CFR).
Research chemical
Biopharmaceutical
Inhalant
Designer drug
Animal products in pharmaceuticals
Cathartic
Cold medicine
Generic drug