Ecromeximab (Anti-GD3) is a human-mouse chimeric IgG1 monoclonal antibody with potential antineoplastic activity that targets ganglioside GD3, a surface antigen expressed on many malignant melanoma cells. It binds to GD3-positive cells, thereby initiating antibody-dependent cytotoxicity against GD3-positive cells. MW: 145.5 KD.