Did you mean C#9?
my bad, I meant to say C minor 11.
C(1) G(5) Bb(m7) Eb(m3) Bb(m7) F(11)
Im thinking in terms of jazz and I like to play the 9th anytime I see an unaltered chord. However, I guess you could make it a rootless C#13b5 chord.
B#(7) G(b5) A#(13) D#(9) A#(13) E#(3)