Other times,the different interaction of enantiomers with chiral biological molecules is serious. The two enantiomers of Thalidomide: beneficial sedative and anti-nausea drug Caused serious birth defects when taken by pregnant women!N N O O O O H H N N O O O O H H Other times, the different interaction of enantiomers with chiral biological molecules is serious. * The two enantiomers of Thalidomide: beneficial sedative and anti-nausea drug * Caused serious birth defects when taken by pregnant women!