B 13#11, 1st inversion (D# in the bass)
Also written as B13#11/D#.
Notes, from the bass up
D# (bass)F#AC#E#G#B
The same notes as B 13#11 (D#, F#, A, C#, E#, G# and B), rearranged so D# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.