From Proteopediaproteopedia link
X-ray crystal structure of human fxa in complex with (S)-N-((2-METHYLBENZOFURAN-5-YLAMINO)(2-OXO-1-(2-OXO-2- (PYRROLIDIN-1-YL)ETHYL)AZEPAN-3- YLAMINO)METHYLENE)NICOTINAMIDE
[FA10_HUMAN] Defects in F10 are the cause of factor X deficiency (FA10D) [MIM:227600]. A hemorrhagic disease with variable presentation. Affected individuals can manifest prolonged nasal and mucosal hemorrhage, menorrhagia, hematuria, and occasionally hemarthrosis. Some patients do not have clinical bleeding diathesis.                
[FA10_HUMAN] Factor Xa is a vitamin K-dependent glycoprotein that converts prothrombin to thrombin in the presence of factor Va, calcium and phospholipid during blood clotting.
Publication Abstract from PubMed
We report the design and synthesis of a novel class of N,N'-disubstituted aroylguanidine-based lactam derivatives as potent and orally active FXa inhibitors. The structure-activity relationships (SAR) investigation led to the discovery of the nicotinoyl guanidine 22 as a potent FXa inhibitor (FXa IC(50)=4 nM, EC(2xPT)=7 microM). However, the potent CYP3A4 inhibition activity (IC(50)=0.3 microM) of 22 precluded its further development. Detailed analysis of the X-ray crystal structure of compound 22 bound to FXa indicated that the substituent at the 6-position of the nicotinoyl group of 22 would be solvent-exposed, suggesting that efforts to attenuate the unwanted CYP activity could focus at this position without affecting FXa potency significantly. Further SAR studies on the 6-substituted nicotinoyl guanidines resulted in the discovery of 6-(dimethylcarbamoyl) nicotinoyl guanidine 36 (BMS-344577, IC(50)=9 nM, EC(2xPT)=2.5 microM), which was found to be a selective, orally efficacious FXa inhibitor with an excellent in vitro liability profile, favorable pharmacokinetics and pharmacodynamics in animal models.
Aroylguanidine-based factor Xa inhibitors: the discovery of BMS-344577.,Shi Y, Li C, O'Connor SP, Zhang J, Shi M, Bisaha SN, Wang Y, Sitkoff D, Pudzianowski AT, Huang C, Klei HE, Kish K, Yanchunas J Jr, Liu EC, Hartl KS, Seiler SM, Steinbacher TE, Schumacher WA, Atwal KS, Stein PD Bioorg Med Chem Lett. 2009 Dec 15;19(24):6882-9. Epub 2009 Oct 23. PMID:19896847
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.