Eb 7b13, 3rd inversion (C# in the bass)
Also written as Eb7b13/C#.
Notes, from the bass up
C# (bass)BD#GA#
The same notes as Eb 7b13 (C#, B, D#, G and A#), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.