D♭ Dominant 7th :: D♭ F A♭ C♭

B
F♯
D
A
♭7
D♭
5
♭7
3
D♭
♭7
3
5
D♭
3
5
♭7
3
D♭
5
⬤ ⬤
♭7
⬤ ⬤