Using NC(=O)N1c2ccccc2CC(=O)c2ccccc21, COC(=O)CCCN to produce COC(=O)CCCN=C1Cc2ccccc2N(C(N)=O)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.