| 31. | Chemically, levocetirizine is the active enantiomer of cetirizine.
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| 32. | This reaction delivers one enantiomer with 88 % ee.
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| 33. | Polarimetry may therefore be applied for concentration measurements of enantiomer-pure samples.
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| 34. | The reaction step creates two stereocenters leading to two diastereomeric pairs of enantiomers.
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| 35. | Similarly, replacement of one or the other with deuterium will generate enantiomers.
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| 36. | Conversely, two compounds that are enantiomers have the same NMR spectral properties.
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| 37. | The latter two clearly refer to the two enantiomers.
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| 38. | It has been reported that the two enantiomers had different toxicokinetics and toxicity.
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| 39. | The stationary phase is itself chiral and forms complexes selectively with the enantiomers.
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| 40. | Both enantiomeric products could be obtained by using different enantiomers of the catalyst.
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