Using CCn1c(Nc2nc3ccc(Cl)cc3s2)nc2cc(C(=O)O)ccc21, COCCN to produce CCn1c(Nc2nc3ccc(Cl)cc3s2)nc2cc(C(=O)NCCOC)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.