4-(2-propan-2-yloxyethoxymethyl)phenol; 4-[[2-(1-Methylethoxy)ethoxy]methyl]phenol; 4-[(2-Isopropoxyethoxy)methyl]phenol; Bisoprolol Tablets Impurity 1; 4-((2-Isopropoxyethoxy)methyl)phenol; Bisoprolol BP Impurity 1