How to play an A#9 chord on Accordion

AKA: A sharp 9, A#7(add9), A#7/9, A#9, A# Dominant 9, A# Dominant ninth, A# Ninth

Notes:

A#, Cx, E#, G#, B#
(A#, D, F, G#, C)

Intervals:

R, 3°, 5°, m7°, 9°

Left hand:

Enharmonic B♭ + B♭M + Fm

Fingering:

4 + 3 + 2