B Major 9#11, 1st inversion (D# in the bass)
Also written as Bmaj9#11/D#.
Notes, from the bass up
D# (bass)F#A#C#E#B
The same notes as B Major 9#11 (D#, F#, A#, C#, E# and B), rearranged so D# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.