The E flat minor eleventh chord is a 6-note chord consisting of the notes Eb, Gb, Bb, Db, F and Ab.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Ebm11.
Interactive piano diagram for the E flat minor eleventh chord
Chords that are a subset of Ebm11. These contain less notes but all of them are included in Ebm11.