E 13b9, 5th inversion (C# in the bass)
Also written as E13b9/C#.
Notes, from the bass up
C# (bass)EG#BDF
The same notes as E 13b9 (C#, E, G#, B, D and F), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.