β-Glucuronide-dPBD-PEG5-NH2 is the β-glucuronide-linked pyrrolobenzodiazepine dimer, which binds to the prenylated antibody for synthesis of antibody-drug conjugate (ADC) cIRCR201-dPBD. β-glucuronide-linkage as a cleavable linker. β-Glucuronide-dPBD-PEG5-NH2, as a proagent of cIRCR201-dPBD, reduces side effects. β-Glucuronide-dPBD-PEG5-NH2 can induce apoptosis and arrest cell cycle. β-Glucuronide-dPBD-PEG5-NH2 has antitumor activity [1] .