Here's a breakdown:

* C: Carbon

* H: Hydrogen

* O: Oxygen

* 6: There are 6 carbon atoms in the molecule.

* 8: There are 8 hydrogen atoms in the molecule.

* 7: There are 7 oxygen atoms in the molecule.

It's important to note that the term "anhydrous" means "without water." Citric acid can exist in both anhydrous and hydrated forms (like citric acid monohydrate, C₆H₈O₇·H₂O).