Eb 7sus2, 2nd inversion (A# in the bass)
Also written as Eb7sus2/A#.
Notes, from the bass up
A# (bass)C#D#E#
The same notes as Eb 7sus2 (A#, C#, D# and E#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.