I need a diagram showing the structure of the asialoglycoprotein receptor 
(ASGP-R) and subunits.

Hi

I don't work for Google but I read your question and thought I could
help.

I searched for "PDB asialoglycoprotein receptor" and the top hit looks
pretty useful. I dno't know who you are or what you know but PDB
stands for protein database and usually if the crystal structure of a
protein is known then there will be a PDB entry. Good huh?

This was the top hit:

http://www.biochem.ucl.ac.uk/bsm/pdbsum/1dv8/main.html

Hope this isn't too late for your essay.
Cheers
James