piano chord
A♭7sus4
A♭1D♭4E♭5G♭♭7
A dominant seventh with the fourth standing in for the third.
Written the other way round it is G♯7sus4 — the same twelve keys on a piano, a different piece of notation.
What is true of it
A♭7sus4 is A♭, D♭, E♭ and G♭ — 1, 4, 5 and b7 counted from A♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.