G Major 7#11, 4th inversion (C# in the bass)
Also written as Gmaj7#11/C#.
Notes, from the bass up
C# (bass)GBDF#
The same notes as G Major 7#11 (C#, G, B, D and F#), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.