Using O=C1c2cccc(O)c2C(=O)c2c(O)cc(-c3nnn[nH]3)cc21 to produce CC(=O)Oc1cccc2c1C(=O)c1c(OC(C)=O)cc(-c3nnn[nH]3)cc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.