Using CCCn1c(=O)c(-c2ccccc2)c2n(c1=O)CCC(O)S2 to produce CCCn1c(=O)c(-c2ccccc2)c2n(c1=O)CC=CS2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.