Using O=C1Cc2nc(Cl)c(Cl)cc2N1, CCOC(=O)c1cccs1 to produce O=C1Nc2cc(Cl)c(Cl)nc2C1C(=O)c1cccs1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.