Fig. 7. Anti-FXa activities of 10 and fondaparinux (24) (0.001–10 μg mL⁻¹) in the presence of ATIII using an FXa specific chromogenic substrate in Tris-EDTA buffer. The absorbance was measured at 405 nm on a plate reader. The results are expressed as means ± the standard deviation (n = 3).