Km values for opioids

[romealone]

I am looking for a list of the km values for the various opiate receptors for common opiates/opioids. You would think this info would be readily available but I spent about 30 minutes googling this info and could not find a source. Could anyone point me in the correct direction or post a list of these km values if they have them. Thanks.

 

[nuke]

http://pdsp.med.unc.edu/pdsp.php

under "test ligand"