Using [N-]=[N+]=[N-], COC(=O)C1CCCN2CC(Br)C(=O)N12 to produce COC(=O)C1CCCN2CC(N=[N+]=[N-])C(=O)N12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.