Eb 13sus4, 2nd inversion (A# in the bass)
Also written as Eb13sus4/A#.
Notes, from the bass up
A# (bass)C#E#B#D#G#
The same notes as Eb 13sus4 (A#, C#, E#, B#, D# and G#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.