(+)-Guaiacin is a compound isolated from the bark of Machilus wangchiana Chun. It shows potent in vitro activities against the release of β-glucuronidase in rat polymorphonuclear leukocytes (PMNs) induced by platelet-activating factor (PAF).
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.