DBCO-PEG4-Ahx-DM1 is a drug-linker conjugate that combines the microtubulin inhibitor DM1 (mertansine), which is an antibody-conjugatable maytansinoid designed to reduce systemic toxicity and improve tumor-specific delivery, with the linker DBCO-PEG4-Ahx, for the development of antibody drug conjugates (ADCs).