Using CCOC(=O)c1cn2nc(OCc3cc(OC)c(OC)c(OC)c3)ccc2n1 to produce COc1cc(COc2ccc3nc(C(=O)O)cn3n2)cc(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.