Using CCOC(=O)c1cnn(CC(=O)O)c1, CC(C)(C)OC(=O)NN to produce CCOC(=O)c1cnn(CC(=O)NNC(=O)OC(C)(C)C)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.