Letaxaban, also known as TAK-442, is a potent, selective, and orally active factor Xa inhibitor, which is a tetrahydropyrimidin-2(1H)-one derivative. TAK-442 inhibited endogenous FXa activity in platelet-poor human [half-maximal inhibitory concentration (IC(50)): 53 nM, TAK-442 ] and rat (IC(50): 32 nM, TAK-442 ) plasma. TAK-442 inhibited in vitro reconstituted human prothrombinase (system included FXa, calcium, and washed platelets) with an IC(50) value of 51 nM. In a rat model of balloon injury, thrombin activity on the surface of injured vessels increased to 3.2-, 22-, and 5.8-fold the activity on the surface of the intact aorta at 5 minutes, 1 hour, and 24 hours after the injury, respectively. At approximately 1 hour after the injury, TAK-442 blocked platelet-associated thrombin generation on the surface of injured aortas with an IC(50) value of 19 nM. (source: J Cardiovasc Pharmacol. 2011 Feb;57(2):201-6.)
MedKoo Cat#: 205895
Name: Letaxaban
CAS#: 870262-90-1
Chemical Formula: C22H26ClN3O5S
Exact Mass: 479.1282
Molecular Weight: 479.98
Elemental Analysis: C, 55.05; H, 5.46; Cl, 7.39; N, 8.75; O, 16.67; S, 6.68
The following data is based on the product molecular weight 479.98 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.
| Concentration / Solvent Volume / Mass | 1 mg | 5 mg | 10 mg |
|---|---|---|---|
| 1 mM | 1.15 mL | 5.76 mL | 11.51 mL |
| 5 mM | 0.23 mL | 1.15 mL | 2.3 mL |
| 10 mM | 0.12 mL | 0.58 mL | 1.15 mL |
| 50 mM | 0.02 mL | 0.12 mL | 0.23 mL |
