Using CCOC(=O)CC(=O)OCC, CC(C)CCn1c(=O)oc(=O)c2cccn21 to produce CCOC(=O)c1c(O)c2cccn2n(CCC(C)C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.