How many chiral centres are in the penicillin molecule?

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How many chiral centres are in the penicillin molecule?

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Answer 1 · 2017-02-06T23:52:29

If I exclude the $R$ $R$ group, I count $7$ $7$ .........

Explanation:

![https://en.wikipedia.org/wiki/Penicillin]( useruploads.socratic.org )

Starting from the amide $N H$ $NH$ , and going clockwise, I count $N H^{1}$ $NH^1$ , $^{1} H N C H^{2}$ $""^1HNCH^2$ , $H^{3} C S$ $H^3CS$ , $C H_{3}^{4}$ $CH_3^4$ , $C H_{3}^{5}$ $CH_3^5$ (the methyls are diastereotopic), $N C H^{6}$ $NCH^6$ , $O H^{7}$ $OH^7$ . And thus there are $7$ $7$ . Do you agree?

If I could label the diagram I would, but I have not got the wherewithal at the moment.

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How many chiral centres are in the penicillin molecule?

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