Using COC(=O)C(N)Cc1ccccc1, S=C(Nc1nccs1)n1ccnc1 to produce COC(=O)C(Cc1ccccc1)NC(=S)Nc1nccs1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.