Exatecan Intermediate 2 hydrochloride (compound B) serves as an intermediary in the synthesis of Exatecan (DX-8951), a camptothecin analog and anticancer agent. This compound operates by interacting with DNA to disrupt the proliferation and division of tumor cells, thereby inhibiting tumor growth. It is primarily researched for its potential applications in treating various cancers including ovarian, lung, and breast cancer.