Using COCOc1c(C=O)csc1-c1ccc(C(C)(C)C)cc1, CCOCC to produce COCOc1c(C(C)O)csc1-c1ccc(C(C)(C)C)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.