hCA/VEGFR-2-IN-3 (compound 8j) is an indolinonylbenzenesulfonamide and a potential dual inhibitor of cancer-associated hCA IX/XII and VEGFR-2. hCA/VEGFR-2-IN-3 inhibits VEGFR-2 ( IC 50 =358 nM), has high binding activity to hCAs with Ki of 4.2 nM (hCA IX), 22.9 nM (hCA II), 25.1 nM (hCA I), 28.0 nM (hCA XII), respectively. hCA/VEGFR-2-IN-3 has antiproliferative activity against VEGFR-2 overexpressing breast cancer cells.