Fig. 5.
ADC conjugated to payload (SN38) through β-glucuronide linker: Release mechanism involves initial de-glucuronidation using enzyme β-glucuronidase followed by 1,6-elimination, decarboxylation, and lastly cyclization of the dimethylethylene diamine (DMED, self-immolative spacer) carbamate to liberate free payload, SN38