Eb 7alt, 2nd inversion (C# in the bass)
Also written as Eb7alt/C#.
Notes, from the bass up
C# (bass)EF#BD#G
The same notes as Eb 7alt (C#, E, F#, B, D# and G), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.