The guys over at /r/Scholar did me another favor: http://www.sendspace.com/file/n6ukiq (Prodynorphin Biosynthesis and Posttranslational Processing) full-text PDF.
Haven't yet read through it, but I imagined you all would be interested in it, seeing as I myself haven't been able to find how Dynorphin is biosynthesized. Yet to read through it though.
I thought if this doesn't work out, inhibiting biosynthesis of Dynorphin may be interesting.
interesting
benthamite said in regards to analysis:
Yes, we had it tested by an independent lab and the results are consistent with the data published by Carroll's team in the journal of Medicinal Chemistry. You might want to use the data from the original paper as a reference.