B 13b9, 1st inversion (D# in the bass)
Also written as B13b9/D#.
Notes, from the bass up
D# (bass)F#ACG#B
The same notes as B 13b9 (D#, F#, A, C, G# and B), rearranged so D# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.