D#7b5 chord
D# dominant seventh flat five
<
1 / 1
>
3
5
7
10
The D#7b5 chord has the formula 1, 3, b5, b7 with notes D#, G, A, C#
The seventh flat five chord is a variation of the dominant seventh chord. It is sometimes used as a passing chord in jazz tunes to resolve at a major or minor seventh chord one half-step down.