Product Description: Tadalafil-13C,d3 is the deuterium and 13C labeled Tadalafil[1].
Formula: C21 13CH16D3N3O4
References: [1]Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019 Feb;53(2):211-216.