3’-Desmethylamino-3’-(methanesulfonyl)hydroxy-10-hydroxy Dehydroxy-hydro-nortriptyline is by-product during the synthesis of 3’-Desmethylamino-3’-(methanesulfonyl)hydroxy-10-hydroxy Nortriptyline (D290715), which is an intermediate in the preparation of Nortriptyline metabolites.