Here's why:

* Molecule: A molecule is formed when two or more atoms bond together.

* Compound: A compound is a substance formed when two or more different elements are chemically bonded together.

C6H12O6 represents the chemical formula for glucose, a sugar. It contains three different elements: carbon (C), hydrogen (H), and oxygen (O). Since it's made up of multiple different elements, it's classified as a compound.

It's also important to note that glucose is a molecule because it's made up of multiple atoms bonded together. However, it's more specifically categorized as a compound due to the presence of different elements.