Eb 13b9, 5th inversion (B# in the bass)
Also written as Eb13b9/B#.
Notes, from the bass up
B# (bass)D#GA#C#E
The same notes as Eb 13b9 (B#, D#, G, A#, C# and E), rearranged so B# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.