SAR about the B-ring of a series of N2-aroyl anthranilamide factor Xa (fXa) inhibitors is described. B-ring o-aminoalkylether and B-ring p-amine probes of the S1′ and S4 sites, respectively, afforded picomolar fXa inhibitors that performed well in in vitro anticoagulation assays. © 2007 Elsevier Ltd. All rights reserved.
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