(S)-3-(tert-Butylamino)-2-((4-morpholino-1,2,5-thiadiazol-3-yl)oxy)propan-1-ol; (2S)-3-(tert-butylamino)-2-[(4-morpholin-4-yl-1,2,5-thiadiazol-3-yl)oxy]propan-1-ol; Timolol Impurity B; (2S)-3-[(2-Methyl-2-propanyl)amino]-2-{[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]oxy}-1-propanol; (S)-2-(tert.-Butylamino)-3-((4-morpholino-1,2,5-thiadiazol-3-yl)oxy)-1-propanol; Timolol Impurity B(S-Isotimolol); Timolol EP Impurity B (S-Isomer); 1-Propanol, 3-[(1,1-dimethylethyl)amino]-2-[[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]oxy]-, (S)- (9CI); Timolol Maleate Impurity B as S-Enantiomer; Timolol Impurity B as S-Enantiomer; Timolol related compound B as S-Enantiomer; Timolol Impurity 26; Timolol Maleate Impurity 12