SU5204, a tyrosine kinase inhibitor, has IC50s of 4 and 51.5 μM for FLK-1 (VEGFR-2) and HER2, respectively[1].
VEGFR2: 4 μM (IC50); HER2: 51.5 μM (IC50)
[1] Peng Cho Tang, et al. 3-heteroaryl-2-indolinone compounds for the treatment of disease. US5792783A.