Antitumor agent-195 (compound 16c) is a dual-targeting agent that simultaneously targets STAT3 and NQO1. At a concentration of 1 μM, it significantly inhibits the phosphorylation of STAT3 at the Tyr705 site and effectively induces apoptosis in MDA-MB-231 and MDA-MB-468 breast cancer cells. As a substrate of NQO1, Antitumor agent-195 markedly increases ROS production, causing severe DNA damage in a dose-dependent manner. It also demonstrates strong antitumor properties in MDA-MB-231 xenograft models.