C Minor 9b5, 2nd inversion (Gb in the bass)
Also written as Cm9b5/Gb.
Notes, from the bass up
Gb (bass)BbDCEb
The same notes as C Minor 9b5 (Gb, Bb, D, C and Eb), rearranged so Gb is the lowest note. Use it to move between chords with smaller jumps across the keyboard.