Using CCNC(=O)c1cc2c(-c3cc(O)c(Cl)cc3Cl)nc(N)nc2s1, CCOC(CBr)OCC to produce CCNC(=O)c1cc2c(-c3cc(OCC(OCC)OCC)c(Cl)cc3Cl)nc(N)nc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.