Using CCCC1CC(=O)c2c(NC(=O)C(=O)OCC)ccc(C)c21 to produce CCCC1CC(=O)c2c(NC(=O)C(=O)O)ccc(C)c21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.