PBD dimer-2 (compound 2c) is a C8-linked pyrrolobenzodiazepine dimer. PBD dimer-2 can span an extra base pair and cross-link the 5′-Pu-GA(T/A)TC-Py sequence. PBD dimer-2 can be used as a payload for antibody–agent conjugates (ADCs), and it can be used for the research of cancer[1][2].