ChEBI: Diisobutyl phthalate is a phthalate ester that is the diester obtained by the formal condensation of the carboxy groups of phthalic acid with two molecules of isobutanol. It has a role as a plasticiser, a teratogenic agent and a PPAR modulator. It is a phthalate ester and a diester. It is functionally related to an isobutanol.