Eb 7alt, 5th inversion (B in the bass)
Also written as Eb7alt/B.
Notes, from the bass up
B (bass)D#GC#EF#
The same notes as Eb 7alt (B, D#, G, C#, E and F#), rearranged so B is the lowest note. Use it to move between chords with smaller jumps across the keyboard.