C#m13 chord

The C-sharp minor thirteenth chord (abbreviated C#m13 chord) is a seven-note chord consisting of the notes C♯, E, G♯, B, D♯, F♯, and A♯. The chord is formed by adding a thirteenth to the C-sharp minor eleventh chord.

In practice, the fifth (G♯) and eleventh (F♯) are often omitted from the C#m13 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.