F# Dominant 13th, 6th inversion (D# in the bass)
Notes, from the bass up
D# (bass)F#A#C#EG#B
The same notes as F# Dominant 13th (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.