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Arylethanolamines derived from salicylamide with .alpha.- and .beta.-adrenoceptor blocking activities. Preparation of labetalol, its enantiomers and related salicylamides
James E. Clifton, Ian Collins, Peter Hallett, David Hartley, Lawrence H. C. Lunts, Philip D. Wicks
J. Med. Chem., 1982, 25 (6), pp 670–679
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http://dx.doi.org/10.1021/jm00348a013