G 7alt, 4th inversion (A# in the bass)
Also written as G7alt/A#.
Notes, from the bass up
A# (bass)EbGBFAb
The same notes as G 7alt (A#, Eb, G, B, F and Ab), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.