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Terphenyllin is the dominant analogue of a family of polyphenyl fungal metabolites produced by Aspergillus candidus. The occurrence of this metabolite is a criterion in the polyphasic taxonomy of A. candidus. Terphenyllin has not been extensively studied but exhibits anti-oxidative activity, acts as a plant growth inhibitor, and shows weak activity against HIV integrase.

ChEBI:Terphenyllin is a para-terphenyl that is 1,1':4',1''-terphenyl substituted by methoxy groups at positions 3' and 6' and hydroxy groups at positions 2', 4 and 4''. It has been isolated from Aspergillus taichungensis. It has a role as a mycotoxin and an Aspergillus metabolite. It is a para-terphenyl, a member of phenols and a dimethoxybenzene.