F 13sus4, 2nd inversion (C in the bass)
Also written as F13sus4/C.
Notes, from the bass up
C (bass)EbGDFBb
The same notes as F 13sus4 (C, Eb, G, D, F and Bb), rearranged so C is the lowest note. Use it to move between chords with smaller jumps across the keyboard.