Task: Translation
Input (Czech): e en  poskytuje (S)-salmeterol pro pou it  jako l  ivo a farmaceutick² p° pravek, kter  obsahuj   ist² (S) izomer salmeterolu, co  je siln  bronchodilatans se sn  en²mi vedlej  mi · inky, p°i em  tento izomer m  lep   selektivitu pro receptory .beta..sub.2.n. ne  odpov daj c  R enantiomer nebo racem t.\
Output (English): The present invention provides (S)-salmeterol for use as a medicament and a pharmaceutical preparation containing the pure (S) isomer of salmeterol which is a potent bronchodilator with reduced adverse effects, having a better selectivity for {beta}i2 receptors than the corresponding R enantiomer or the racemate.