The shrub ma huang (Section 5.4 A) contains two biologically active stereoisomers - ephedrine and pseudoephedrine-with two stereogenic centers as shown in the given structure. Ephedrine is one component of a once popular combination drug used by body builders to increase energy and alertness, while pseudoephedrine is a nasal decongestant. a. Draw the structure of naturally occurring (-) -ephedrine, which has the 1 R, 2  S configuration. b. Draw the structure of naturally occurring ( )-pseudoephe
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