Using CCOC(=O)C1CC(=O)c2cc(-n3cnc4cccnc43)ccc21 to produce O=C1CC(C(=O)O)c2ccc(-n3cnc4cccnc43)cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.