C Major 7#11, 4th inversion (F# in the bass)
Also written as Cmaj7#11/F#.
Notes, from the bass up
F# (bass)CEGB
The same notes as C Major 7#11 (F#, C, E, G and B), rearranged so F# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.