Chemical Name: (3S,8R,9S,10R,12S,13R,14S,17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthrene-3,12-diol
Synonym: Isoproterenol Impurity RRT 3.2 ; 4-(1-hydroxy-2-(isopropylamino)ethyl)-2-methoxyphenol