Cetrizine is chiral. Like many chiral drugs, one enantiomer of cetrizine is more active than the other enantiomer or the racemic mixture. The levorotatory (S) enantiomer of cetrizine is more active, and syntheses have been developed that produce only the desired enantiomer in high yield. Label the chiral center of cetrizine with an asterisk. CI Cetrizine -CO,H

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Aldehydes and Ketones

Aldehydes and ketones are organic compounds that have a carbonyl group, C = O, as their functional group. They both differ in the placement of this carbonyl group in their structures.