CAS 82938-05-4 appears in our catalog under these names: 17-beta-Estradiol-13C2, 17Beta-Estradiol-13C2, >95% (HPLC), Estradiol–13C2, Estradiol-13C2. Offered by: Chemat Brand, TRC, GLPBio, MedChemExpress. Available pack sizes: on request, 10mg, 1mg, 1 mg.