Using O, CCCC(=O)c1cnc2c(OCCSC)cccc2c1Nc1c(C)cccc1Cl to produce CCCC(=O)c1cnc2c(OCCS(C)=O)cccc2c1Nc1c(C)cccc1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.