Using COc1ccc(N2CCOCC2)c2sc(NC(=O)c3ccc(Cl)nc3)nc12, COCCO to produce COCCOc1ccc(C(=O)Nc2nc3c(OC)ccc(N4CCOCC4)c3s2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.