The quantitative differences in biological activity between the two enantiomers of a compound are sometimes quite large. For example, the D isomer of the drug isoproterenol, used to treat mild asthma, is 50 to 80 times more effective as a bronchodilator than the L isomer. Identify whether each of the indicated atoms in isoproterenol is a chiral center or achiral. chiral center OH ST HO H HO achiral CH₂ Isoproterenol H H chiral center -N-C-CH₂ CH 3 achiral

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