The E flat sixth/ninth chord is a 5-note chord consisting of the notes Eb, G, Bb, C and F.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Eb6/9.
Chords that are a superset of Eb6/9. The chords include more notes but always Eb, G, Bb, C and F.
Chords that are a subset of Eb6/9. These contain less notes but all of them are included in Eb6/9.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Eb6/9 chord. Feel free to save or share the image as needed.