Diisononyl Phthalate-13C6,d4 is the isotope labelled of Diisononyl Phthalate. Diisononyl Phthalate is a widely used chemical with potential thyroid-disrupting properties. Used in toxicology studies as well as risk assessment studies of food contamination that occurs via migration of phthalates into foodstuffs from food-contact materials (FCM).