Hm, not sure, thought this might be interesting for people interested in opiates ... (Also not sure if this is the right forum for this):
http://edoc.ub.uni-muenchen.de/archive/00000217/ (http://edoc.ub.uni-muenchen.de/archive/00000217/)
It's about Morphinandienones like Salutaridine and amongst other things about Biosynthesis of these compounds from a plant called "Croton flavens L." to Thebain, Codeine and Morphine. At least it sounded interesting to me ...
Sorry, it seems to be only available in german as far as i can see. (Also available as PDF file)