(Rac)-5-Hydroxymethyl Tolterodine ((Rac)-Desfesoterodine) hydrochloride, an active metabolite of Tolterodine, is a mAChR antagonist ( K i values of 2.3 nM, 2 nM, 2.5 nM, 2.8 nM, and 2.9 nM for M1 , M2 , M3 , M4 , and M5 receptors , respectively). (Rac)-5-Hydroxymethyl Tolterodine hydrochloride can be used for overactive bladder research.