Used in the synthesis of eribulin, a potent anticancer agent, this intermediate plays a critical role in the production of the final active pharmaceutical ingredient. It enables the construction of the complex macrocyclic structure essential for the drug’s mechanism of action, which involves inhibiting microtubule dynamics in cancer cells. Due to its precise structural features, the intermediate ensures high stereochemical accuracy and yield during the manufacturing process, making it indispensable for scalable and efficient synthesis of the drug used in treating metastatic breast cancer and other solid tumors.