Challenge question: Opiorphin is a natural painkiller present in human saliva. Determine the absolute (R, S) configuration for each stereocenter in Opiorphin.

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Challenge question: Opiorphin is a natural painkiller present in human saliva. Determine the absolute (R, S) configuration for each stereocenter in Opiorphin.

Chemistry
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Well I see 5 stereo centers
I'm also seeing 5 stereocentres R was clockwise, S is counterclockwise From left to right I got R, S, R, S, R I don't have a clue if I did this right though, I didn't grasp the complete concept when I learned it at school.

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Other answers:

I see 7.
I'm pretty sure there is 5 just looked it up http://pubchem.ncbi.nlm.nih.gov/compound/25195667#section=Chemical-and-Physical-Properties Under 4.1 computed properties In the table it says 5 as well for defined atom stereocentre count
I will just answer it without even looking at the structure: Opiorphin being a non-glycine penta-peptide hormone means there must be 5 asymmetric carbon, usually we name peptides after the super old l and d convention. Almost all natural occurring amino acids are on l form which is the equivalent of the S form, making my guess (2S, 5S, 8S, 11S, 14S) named according peptide backbone after biochemical convention. ยจ @aaronq Cheater to use a peptide and not link me!
5 is right, and yes they're all S. @Frostbite great deduction ..but you're not allowed to think before answering a question, you're supposed to just do as you're told lol jk you clever mofo knowing that all natural amino acids are L (or S) and all sugars are D (or R) comes in handy.
Nature never screw up in terms of stereochemistry (thank you enzymes), while the chemists tend to do! :D (R and S thalidomid,,, I rest my case!)

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