Using CCC(CC)c1cccc2c1n(CC(=O)OC(C)C)c(=O)n2C(=O)OC(C)(C)C to produce CCC(CC)c1cccc2[nH]c(=O)n(CC(=O)OC(C)C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.