CAS 66789-03-5 appears in our catalog under these names: Estradiol–d4, Estradiol-d4 (Estradiol Valerate EP Impurity A-d4, Estriol EP Impurity D-d4, Ethinylestradiol EP Impurity D-d4), 17Beta-Estradiol-d4, >95% (HPLC), 17beta-Estradiol-2,4,16,16-d4, 98 atom % D, min 98% Chemical Purity, Estradiol-d4, 99.55%. Offered by: GLPBio, Chemat Brand, TRC, CDN, MedChemExpress. Available pack sizes: 5mg, on request, 10mg, 1mg, 2,5mg, 0,05g, 0,01g, 1 mg.