β-Glucuronide-dPBD-PEG5-NH2 TFA 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 TFA, as a proagent of cIRCR201-dPBD, reduces side effects. β-Glucuronide-dPBD-PEG5-NH2 TFA can induce apoptosis and arrest cell cycle. β-Glucuronide-dPBD-PEG5-NH2 TFA has antitumor activity [1] .