Using COC(=O)c1ccc2ccc(Oc3ccnc4cc(OC)c(OC)cc34)cc2c1 to produce COc1cc2nccc(Oc3ccc4ccc(C(=O)O)cc4c3)c2cc1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.