Motek: You claim read internet chemistry boards but when all the evidence is infront of you - you cant put 2 and 2 together. You ask where on the morphine molecule the extra carbon goes? This method involves an anhydride.... How about acetic anhydride with an extra carbon.....: propanoic anhydride! This is just morphine which instead of acetylated has become propnylated or whatever you call it. The body breaks it down slower which accounts for the longer halflife, and the added lipophillity due to the extra carbon helps it cross the blood brain barrier more easily. Stop posting in all my threads because I insulted you while you were talking shit about my services.