Hexatonic Scales
E♭m over C (minor triad over major triad a minor third apart).
C           E        G        B♭             E♭       G♭
1           3        5        ♭7             ♯9       ♭5

Parent scales are B♭ diminished (no ♭3 or 7) or C♯ diminished (no 1 or ♯5) or E diminished ((no 4 or 6) or G diminished ((no 2 or ♭5).
C        E♭ E     G♭ G        B♭
1        ♭3 3     ♭5 5        ♭7

Related chords (reverse diminished).
| A13♯9 (no 1 or 3) | C13♯9 (no ♭9 or 6) | E♭13♯9 (no ♯4 or ♭7) | F♯7♭9♯11 (no ♯9 or 5) |
A7
♭7 6 5 ♯4 ♯9 ♭9 ♭7 6 5 ♯4 ♯9 ♭9 ♭7
A7
♯9 ♭9 ♭7 6 5 ♯4 ♯9 ♭9 ♭7 6 5 ♯4 ♯9 ♭9
A7
♯4 ♯9 ♭9 ♭7 6 5 ♯4 ♯9 ♭9 ♭7 6 5 ♯4
A7
6 5 ♯4 ♯9 ♭9 ♭7 6 5 ♯4 ♯9 ♭9 ♭7 6 5
C7
5 ♯4 3 ♯9 1 ♭7 5 ♯4 3 ♯9 1 ♭7 5
C7
1 ♭7 5 ♯4 3 ♯9 1 ♭7 5 ♯4 3 ♯9 1 ♭7
C7
♯9 1 ♭7 5 ♯4 3 ♯9 1 ♭7 5 ♯4 3 ♯9
C7
♯4 3 ♯9 1 ♭7 5 ♯4 3 ♯9 1 ♭7 5 ♯4 3
E♭7
3 ♯9 b9 1 6 5 3 ♯9 b9 1 6 5 3
E♭7
6 5 3 ♯9 b9 1 6 5 3 ♯9 b9 1 6 5
E♭7
1 6 5 3 ♯9 b9 1 6 5 3 ♯9 b9 1
E♭7
♯9 b9 1 6 5 3 ♯9 b9 1 6 5 3 ♯9 b9
F♯7
b9 1 b7 6 ♯4 3 b9 1 b7 6 ♯4 3 b9
F♯7
♯4 3 b9 1 b7 6 ♯4 3 b9 1 b7 6 ♯4 3
F♯7
6 ♯4 3 b9 1 b7 6 ♯4 3 b9 1 b7 6
F♯7
1 b7 6 ♯4 3 b9 1 b7 6 ♯4 3 b9 1 b7