piano scale
E♭ Dorian
E♭1F2G♭♭3A♭4B♭5C6D♭♭7
Minor with a natural sixth. The second mode of the major scale.
The same sounds spelled from the other side are D♯ Dorian.
Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
E♭WFHG♭WA♭WB♭WCHD♭WE♭
What is true of it
E♭ Dorian is E♭, F, G♭, A♭, B♭, C and D♭, and back to E♭.
Its steps are W – H – W – W – W – H – W, where W is a whole step and H a half.
On the same tonic, E♭ natural minor differs from it by exactly one note.
Chords made only of these notes
CdimdiminishedCm7♭5half-diminished seventhD♭majorD♭maj7major seventhE♭mminorE♭m7minor seventhFmminorFm7minor seventh
Found by testing every chord in the catalogue against these 7 sounds, not chosen.