Using O=C1NC(=S)CS1, N=C1NC(=N)c2c(Cl)c(Cl)c(Cl)c(Cl)c21 to produce N=C1NC(=C2SC(=O)NC2=S)c2c(Cl)c(Cl)c(Cl)c(Cl)c21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.