(S)-Seco-Duocarmycin SA is the S-enantiomer of Seco-Duocarmycin SA (HY-129356). Seco-Duocarmycin SA is a DNA alkylating agent. Seco-Duocarmycin SA is an antitumor antibiotic (IC50 = 10 pM). Seco-Duocarmycin SA can induce a concentration-dependent increase in apoptotic cell death. Seco-Duocarmycin SA can lead to significant cell cycle arrest in S and G2/M phases. Seco-Duocarmycin SA acts as an ADC cytotoxin for antibody-drug conjugates[1][2][3].