Notes used in C♯ minor Dominant 9 Chord:
C♯ + E + G♯ + B + D♯
minor Dominant 9 chords are played combining a root, minor (♭) third, perfect fifth, minor (♭) seventh, and nineth notes of the root note's major scale.
minor Dominant 9 Chord Formula:
1 + 3♭ + 5 + 7♭ + 9