The key of E♭ minor
E♭ F G♭ A♭ B♭ C♭ D♭
6 flats: B♭ E♭ A♭ D♭ G♭ C♭. Relative major: The key of G♭ major.
The triads of the key
i E♭m | ii° F° | III G♭ | iv A♭m | v B♭m | VI C♭ | VII D♭ |
The seventh chords
i7 E♭m7 | iiø7 Fm7♭5 | IIImaj7 G♭maj7 | iv7 A♭m7 | v7 B♭m7 | VImaj7 C♭maj7 | VII7 D♭7 |
In practice the V of a minor key is almost always major, taken from the harmonic minor: B♭7 (V7), which carries the leading tone D.
E♭ natural minor scale
Open it in the app: 6. Harmony, in E♭