Using CC(C)(C)OC(=O)NCCc1cc2c(OC(=O)OC(C)(C)C)ncnc2s1 to produce CC(C)(C)OC(=O)NCCc1cc2c(O)ncnc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.