Stereoisomers Help

[uhds]

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Hello,

I am having trouble seeing how of Quinine has 4 centers of chirality? I could only see 2, I don't see how there are other two places where an asymmetric center would be.

If you can help me out, thank you! 🙂

 

[uhds]

Sorry, for got to post the image haha.

 

[Lnguyen7]

The four chiral centers are already marked on the image. These carbons have 4 different groups attached to it.

 

[averageasian]

a chiral center is a carbon with 4 different substituents connected to it. you can clearly see these 4 chiral carbon if you look and make sure all four 4bons to carbon are connected to something different