6-[4-(4-methoxybenzoyl)oxyphenoxy]-6-oxohexanoate

6-oxo-6-[4-(4-propoxybenzoyl)oxyphenoxy]hexanoate

benzyl 6-(diethylamino)-6-oxohexanoate

1,6-bis(4-ethoxyphenyl)hexane-1,6-dione

1,6-bis(diphenylphosphanyl)hexane-1,6-dione