(R)-4-(2-(Dimethylamino)-1-hydroxyethyl)-1,2-phenylene 2,2-dimethylpropanoate 81497-25-8 Dipivalyl alpha-methylepinephrine Propanoic acid, 2,2-dimethyl-, 4-(2-(dimethylamino)-1-hydroxyethyl)-1,2-phenylene ester, (R)- alpha-Methylepinephrine dipivalate