Bb Major 9#11, 2nd inversion (E# in the bass)
Also written as Bbmaj9#11/E#.
Notes, from the bass up
E# (bass)AB#EA#D
The same notes as Bb Major 9#11 (E#, A, B#, E, A# and D), rearranged so E# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.