Using S=c1[nH]c(NCCSCc2ncccc2Cl)ncc1Cc1cccnc1, O=C(O)C=Cc1cnc2ccccc2c1 to produce CCOC(=O)C=Cc1cnc2ccccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.