A tumor vascular disrupting agent, inducing apoptosis in tumor vascular endothelium resulting in necrosis at the tumor core; potently activates the STING/TBK1/IRF3 signaling pathway in mouse leukocytes, inducing type-I-IFN production; inhibits VEGFR1 and VEGFR2 (IC50 = 119 and 11 μM, respectively)