Give the skeletal structure for the peptide IYQ. (Ignore stereochemistry)

Skeletal structure of the peptide IYQ, showing amino acid connections.

Skeletal structure of the peptide IYQ with an amine group at the end.

Skeletal structure of the peptide IYQ with a fused ring structure.

Skeletal structure of the peptide IYQ with a fused ring and an amine group.