Using CCOC(=O)C1CCn2c(C(=O)c3ccc4n3CCC4)c(C)c(C(=O)O)c21 to produce CCOC(=O)C1CCn2c1cc(C)c2C(=O)c1ccc2n1CCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.