Ephedrine A Very Potent Dilator Of Aif Passages In Te Lungs Has Been Used To Tre

Why is the second carbon R? Shouldn’t it be S? Could someone please explain this to me?

18. Ephedrine , a very potent dilator of aif passages in‘tfie lungs, has been used to treat asthma.The naturally occurring stereoisomer isolable from the plant Ephedra sinica is levorotatory ( [on] I 40”) and has the configuration shown below. HSGP’Vl/ H m eH H s‘fiffi‘HH3CHN CH3 3 3—" 0 -‘_" [K Crop AnswerH P‘ OH F!» KPh’