Using CCOC(=O)c1c(C)oc2ccc(Oc3nc(OC)cc(OC)n3)c(C(=O)O)c12, CC(C)(C)C(=O)OCCl to produce CCOC(=O)c1c(C)oc2ccc(Oc3nc(OC)cc(OC)n3)c(C(=O)OCOC(=O)C(C)(C)C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.