SG3199

SG3199 is a **synthetic pyrrolobenzodiazepine (PBD) dimer** engineered as a DNA minor groove cross-linking agent with **potent cytotoxicity** against a broad range of human solid tumor and hematological cancer cell lines. It acts by forming highly cytotoxic DNA interstrand cross-links that are non-distorting and evade normal DNA repair mechanisms. SG3199 is primarily used as the **released warhead component** of antibody-drug conjugate (ADC) payloads such as tesirine, which is incorporated into several experimental ADCs for targeted cancer therapy. The compound demonstrates high plasma protein binding across species (>90%), rapid cellular uptake, and a very short half-life upon intravenous administration, which helps minimize systemic toxicity. Its effectiveness is enhanced in tumor cells with defects in DNA repair mechanisms, and it is only moderately susceptible to common drug resistance mechanisms[1][5][10][13][16][18].