The F-flat dominant seventh suspended fourth chord (abbreviated "Fb7sus4 chord") is a four-note chord consisting of the notes F♭, B♭♭, C♭, and E♭♭. The chord is formed by adding a minor seventh to a F-flat suspended fourth chord.
F-flat dominant seventh suspended fourth chord
F♭ B♭♭ C♭ E♭♭
1 4 5 ♭7
Tetrad (four-note chord)