Valproic Acid Methyl Ester-d3 is the isotope labelled analog of Valproic Acid Methyl Ester (V094775); the methyl ester derivative of Valproic Acid (V094750) which is one of the major antiepileptic drugs. Valproic Acid is also an anticonvulsant that acts as a mood stabilizer for the treatment of bipolar disorder.