Using CC(=O)OC(C(=O)O)C(OC(C)=O)C(=O)NCc1ccc2c(c1)-c1n[nH]c(=O)c3cccc(c13)O2 to produce O=C(O)C(O)C(O)C(=O)NCc1ccc2c(c1)-c1n[nH]c(=O)c3cccc(c13)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.