Using N=C(N)N, COC(=O)c1ccc2c(c1)[nH]c1ccccc12 to produce NC(N)=NC(=O)c1ccc2c(c1)[nH]c1ccccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.