Using CCCCc1nc2c(N)nc3ccccc3c2n1CC(C)(C)C(=O)OC, N to produce CCCCc1nc2c(N)nc3ccccc3c2n1CC(C)(C)C(N)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.