Cm11 chord

The C minor eleventh chord (abbreviated Cm11 chord) is a six-note chord consisting of the notes C, E♭, G, B♭, D, and F. The chord is formed by adding an eleventh to the C minor ninth chord.

In practice, the fifth (G) is often omitted from the Cm11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.