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KDR-in-4 is a potent kinase insert domain-containing receptor (KDR/VEGFR2) inhibitor with an IC50 of 7 nM.

KDR (kinase insert domain-containing receptor) is one of the human tyrosine kinases that has a high affinity for vascular endothelial growth factor (VEGF) and is believed to be a primary mediator of tumor-induced angiogenesis[1].

KDR-in-4 may prove to be useful for the treatment of a variety of ocular neovascular diseases using a convenient oral dosing regimen. At doses of 100 mg/kg, KDR-in-4 results in a 98% reduction in lesion size in the rat choroidal neovascularization (CNV) model. 30 mg/kg doses of KDR-in-4 shows a 70% and 80% reduction in lesion size in the laser CNV and rat oxygen induced retinopathy (OIR) models, respectively[2].

[1]. Fang YQ, et al. Efficient syntheses of KDR kinase inhibitors using a Pd-catalyzed tandem C-N/Suzuki coupling as the key step. J Org Chem. 2007 Feb 16;72(4):1341-6. [2]. Kinose F, et al. Inhibition of retinal and choroidal neovascularization by a novel KDR kinase inhibitor. Molecular Vision 2005; 11:366-373

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