D# Minor 9b5, 3rd inversion (C# in the bass)
Also written as D#m9b5/C#.
Notes, from the bass up
C# (bass)E#D#F#A
The same notes as D# Minor 9b5 (C#, E#, D#, F# and A), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.