(Rac)-5-Hydroxymethyl Tolterodine ((Rac)-Desfesoterodine), an active metabolite of Tolterodine, is a mAChR antagonist (Ki 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 can be used for overactive bladder research.IC50 & Target: Ki: M1 (2.3 nM), M2 (2 nM), M3 (2.5 nM), M4 (2.8 nM), and M5 (2.9 nM)In Vitro: In vitro, (Rac)-5-Hydroxymethyl Tolterodine (PNU-200577) produces a competitive and concentration-dependent inhibition of carbachol-induced contraction of guinea-pig isolated urinary bladder strips (KB of 0.84 nM; pA2 of 9.14)[2].In Vivo: (Rac)-5-Hydroxymethyl Tolterodine (5-HMT; 0.88 μmol/kg; i.v.) treatment shows the binding activity of (Rac)-5-Hydroxymethyl Tolterodine to muscarinic receptors is significantly observed in all tissues, except cerebral cortex, with a longer duration in bladder.