N-Heptanoic Acid Tianeptine Disodium Salt-d12 is the isotope labelled analog of N-Heptanoic Acid Tianeptine Disodium Salt (H281500); the impurity E of Tianeptine (T436800) which is a tricyclic compound with psychostimulant, anti-ulcer and anti-emetic properties. Also an antidepressant.