Using CNc1cc(C(=O)OC)c(C)cc1N, CC(C)(C)OC(=O)NC1(C(=O)O)CCC1 to produce COC(=O)c1cc2c(cc1C)nc(C1(NC(=O)OC(C)(C)C)CCC1)n2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.