CAS 1784139-98-5 appears in our catalog under these names: Nortriptyline EP Impurity B-d3 HCl (Cyclobenzaprine USP Related Compound B-d3, N-Desmethyl Cyclobenzaprine-d3 HCl), Desmethylcyclobenzaprine-d3 (hydrochloride). Offered by: Chemat Brand, MedChemExpress. Available pack sizes: on request, 5mg, 1mg.