When randomly playing chords, my husband and I stumbled upon an interesting four-note combination of C, Eb, Gb and B natural, which sounded pretty nice to us despite the dissonance. This looks like a C minor major 7th chord with a flattened fifth (CmM7b5) but i wonder whether this syntax is correct, and/or whether such group of chords exist in practical use (not merely theoretical)?
Additionally, if these chords are used in practice, what are the proper uses of them? (eg. What kind of chord should they resolve into)?