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Updated: Aug 10, 2026

Characterizing Modulators of Protease-Activated Receptors with a Calcium Mobilization Assay Using a Plate Reader
Published on: May 24, 2024
The discovery of glycine and related amino acid-based factor Xa inhibitors
Jeffrey T Kohrt1, Kevin J Filipski, Wayne L Cody
1Pfizer Global Research and Development, Michigan Labs, Ann Arbor, 48105, USA. jeffrey.kohrt@pfizer.com
Abstract:
Herein, we report on the identification of three potent glycine and related amino acid-based series of FXa inhibitors containing a neutral P1 chlorophenyl pharmacophore. A X-ray crystal structure has shown that constrained glycine derivatives with optimized N-substitution can greatly increase hydrophobic interactions in the FXa active site. Also, the substitution of a pyridone ring for a phenylsulfone ring in the P4 sidechain resulted in an inhibitor with enhanced oral bioavailability.
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