Using O=Cc1c[nH]c2ncccc12, CCCOc1ccc(NC2=C(C(=O)OCC)C(=O)CO2)cc1 to produce CCCOc1ccc(NC2=C(C(=O)OCC)C(=O)C(=Cc3c[nH]c4ncccc34)O2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.