Bb 13#11, 3rd inversion (G# in the bass)
Also written as Bb13#11/G#.
Notes, from the bass up
G# (bass)B#EGA#DE#
The same notes as Bb 13#11 (G#, B#, E, G, A#, D and E#), rearranged so G# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.