Using O=C([O-])[O-], COc1ccc2c(OCc3nnc4ccc(C#N)cn34)ccnc2c1 to produce COc1ccc2c(OCc3nnc4ccc(C(=O)O)cn34)ccnc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.