Using CC(=O)OC(C)=O, COCCSc1cnc(Nc2nc(C3CC4CCC(C3)N4)ns2)c(Oc2cccnc2C)c1 to produce COCCSc1cnc(Nc2nc(C3CC4CCC(C3)N4C(C)=O)ns2)c(Oc2cccnc2C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.