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5-HM 5-HMT PNU 200577 PNU-200577 Desfesoterodine Fesoterodine Diol Fesoterodine Diol (R)-Isomer (R)-5-Hydroxymethyl tolterodine Fesoterodine fumarate Intermediate 2 Tolterodine 5-Hydroxymethyl (R)-Isomer 5-hydroxyMethyl tolterodine (PNU 200577) (R)-5-HydroxyMethyl Tolterodine USP/EP/BP Fesoterodine Impurity 1(Fesoterodine Diol) 5-hydroxyMethyl Tolterodine (PNU 200577, 5-HMT, 5-HM) R-(+)-2-(3-diisopropylamino-1-phenylpropyl)-4-hydroxymethylphenol 2-[(1R)-3-(dipropan-2-ylamino)-1-phenylpropyl]-4-(hydroxymethyl)phenol (R)-2-(3-(diisopropylaMino)-1-phenylpropyl)-4-(hydroxyMethyl)phenol (5-HMT) 3-[(1R)-3-[Bis(1-methylethyl)amino]-1-phenylpropyl]-4-hydroxybenzenemethanol Benzenemethanol, 3-[(1R)-3-[bis(1-methylethyl)amino]-1-phenylpropyl]-4-hydroxy-