Using NN, CCOC(=O)C1CN(C(=O)OC(C)(C)C)CC(=CN(C)C)C1=O to produce CCOC(=O)C1CN(C(=O)OC(C)(C)C)Cc2c[nH]nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.