3-Chlorobenzoic-d4 Acid is labelled 3-Chlorobenzoic Acid (C364645) which is a fundamental chemical building block commonly used in organic synthesis of more complex structures. It is also a benzoic acid analogue that showed antifungal activity against strains of Aspergillus flavus, Aspergillus fumigatus and Aspergillus terreus, causative agents of human aspergillosis, in vitro bioassays.