– (Rac)-5-Hydroxymethyl Tolterodine hydrochloride, also known as (Rac)-Desfesoterodine hydrochloride, is an active metabolite of Tolterodine that functions as a mAChR antagonist. It exhibits significant affinity (K i values) for M1, M2, M3, M4, and M5 receptors, with values of 2.3 nM, 2 nM, 2.5 nM, 2.8 nM, and 2.9 nM, respectively. This compound is commonly employed in research related to overactive bladder conditions.