D 7alt, 4th inversion (E# in the bass)
Also written as D7alt/E#.
Notes, from the bass up
E# (bass)BbDF#CEb
The same notes as D 7alt (E#, Bb, D, F#, C and Eb), rearranged so E# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.