4-Chloroguaiaco (4-Chloro-2-methoxyphenol) is a phenol derivative, with antimicrobial activity. 4-Chloroguaiaco shows inhibition against S. aureus and E. coli with MICs of both 110 μg mL[1]. [1]. Patrícia Fontes Pinheiro, et al. Semisynthetic Phenol Derivatives Obtained from Natural Phenols: Antimicrobial Activity and Molecular Properties. J Agric Food Chem. 2018 Jan 10;66(1):323-330.