Using CCOC(=O)c1nn(CC(=O)NCC(=O)CC)c2c1CCCC2=O to produce CCOC(=O)c1nn(Cc2ncc(CC)o2)c2c1CCCC2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.