Using O=C([O-])[O-], CCCCc1cn2nc3c(c(=O)n(CCC)c(=O)n3Cc3ccccc3)c2[nH]1 to produce CCCCc1cn2nc3c(c(=O)n(CCC)c(=O)n3Cc3ccccc3)c2n1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.