Using COc1ccc2c(c1)C(CC(=O)O)=C(C)C2=Cc1ccc(SC)cc1, O to produce COc1ccc2c(c1)C(CC(=O)O)=C(C)C2=Cc1ccc(S(C)=O)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.