C₃H₆O₃ is:

Explanation

The chemical formula C₃H₆O₃ corresponds to lactic acid, which is produced during anaerobic respiration, particularly in muscle cells when oxygen is scarce. Pyruvic acid (C₃H₄O₃) is a different molecule that is converted into lactic acid during anaerobic conditions. Ethyl alcohol (ethanol) and acetyl-CoA have different chemical structures and roles in metabolism. Ethanol is a product of fermentation in yeast, and acetyl-CoA is a key metabolic intermediate, not a simple organic compound like lactic acid.