L1011 SIGMA Labetalol hydrochloride >98% (TLC), powder Synonym: 2-Hydroxy-5-[1-hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]benzamide hydrochloride CAS Number 32780-64-6 Empirical Formula (Hill Notation) C19H24N2O3 · HCl Molecular Weight 364.87 assay >98% (TLC) form powder color white solubility H2O: soluble ethanol: soluble