Dibutyl 3-hydroxybutyl phosphate is a compound produced from the metabolism of the organophosphorus solvent, tributylphosphate (TBP). Incubation of goldfish liver microsomes in the presence of NADPH has been shown to convert TBP into dibutyl-3-hydroxybutyl phosphate and dibutyl phosphate. Dibutyl-3-hydroxybutyl phosphate has also been produced during radiolysis of TBP.