text: Phenolic acids can be found in mushroom basidiomycetes species. For example, protocatechuic acid and pyrocatechol are found in Agaricus bisporus as well as other phenylated substances like phenylacetic and phenylpyruvic acids. Other compounds like atromentin and thelephoric acid can also be isolated from fungi in the Agaricomycetes class. Orobol, an isoflavone, can be isolated from Aspergillus niger.
  ; In yeasts
  Aromatic alcohols (example: tyrosol) are produced by the yeast Candida albicans. They are also found in beer. These molecules are quorum sensing compounds for Saccharomyces cerevisiae.
  ; Metabolism
  Aryl-alcohol dehydrogenase uses an aromatic alcohol and NAD to produce an aromatic aldehyde, NADH and H.
  Aryl-alcohol dehydrogenase (NADP+) uses an aromatic alcohol and NADP to produce an aromatic aldehyde, NADPH and H.
  Aryldialkylphosphatase (also known as organophosphorus hydrolase, phosphotriesterase, and paraoxon hydrolase) uses an aryl dialkyl phosphate and HO to produce dialkyl phosphate and an aryl alcohol.