Using CCC1CCc2ccc(N(NC(=O)OC(C)(C)C)C(=O)OC(C)(C)C)cc21, CCOC(=O)CC(C)=O to produce CCC1CCc2ccc(N3N=C(C)CC3=O)cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.