Using COC(=O)CCc1c2n(c(=O)c3cc(OC)ccc13)CCc1ccccc1-2 to produce COc1ccc2c(CCC(=O)O)c3n(c(=O)c2c1)CCc1ccccc1-3, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.