Using COC(=O)CCc1c2n(c(=O)c3ccccc13)CCc1ccccc1-2 to produce O=C(O)CCc1c2n(c(=O)c3ccccc13)CCc1ccccc1-2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.