Eb 13sus4, 5th inversion (B# in the bass)
Also written as Eb13sus4/B#.
Notes, from the bass up
B# (bass)D#G#A#C#E#
The same notes as Eb 13sus4 (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.