Using COc1cc(OC)cc(C(O)c2ccc3c(c2)nc(C)n3C)c1 to produce COc1cc(OC)cc(C(=O)c2ccc3c(c2)nc(C)n3C)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.