Ab Major 9#11, 2nd inversion (D# in the bass)
Also written as Abmaj9#11/D#.
Notes, from the bass up
D# (bass)GA#DG#B#
The same notes as Ab Major 9#11 (D#, G, A#, D, G# and B#), rearranged so D# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.