t-Butylnorsynephrine;2-tert-Butylamino-1-(4-hydroxyphenyl)ethanol;Salbutamol EP Impurity B;4-[2-(tert-Butylamino)-1-hydroxyethyl]phenol;Salbutamol Impurity 2(Salbutamol EP Impurity B);Salbutamol EP Imp B;Imp. B (EP):(1RS)-2-[(1,1-Dimethylethyl)-amino]-1-(4-hydroxyphenyl)ethano;Benzenemethanol, α-[[(1,1-dimethylethyl)amino]methyl]-4-hydroxy-