Pyrocatechol its sulfonic acid is often present in the urine of many mammals. Small amounts of catechol occur naturally in fruits and vegetables along with the enzyme polyphenol oxidase. Upon mixing the enzyme with the substrate and exposure to oxygen (as when a potato or apple is cut) the colorless catechol oxidizes to reddish-brown benzoquinone derivatives.

1-Naphthaleneacetate is used as a plant Growth Regulator that affects conidial germination sporulation mycelial growth cell surface morphology and the viability of certain fungal plant pathogens.

PF-03382792 (PF-3382792) is a clinical compound under phase 1 investigation for an unknown indication.