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’