Using O=C([O-])[O-], CCCc1c(OCCCCCc2nnn[nH]2)ccc(C(C)=O)c1O to produce CCCc1c(OCCCCCc2nnnn2C)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.