F# 13b9, 5th inversion (D# in the bass)
Also written as F#13b9/D#.
Notes, from the bass up
D# (bass)F#A#C#EG
The same notes as F# 13b9 (D#, F#, A#, C#, E and G), rearranged so D# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.