3,4,5-trimethoxybenzoic acid is a benzoic acid derivative carrying 3-, 4- and 5-methoxy substituents. It has a role as a plant metabolite, a human xenobiotic metabolite and a human urinary metabolite. It is a member of benzoic acids and a member of methoxybenzenes. It is functionally related to a benzoic acid. It is a conjugate acid of a 3,4,5-trimethoxybenzoate.