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It should be noted that DDT was a poor example to use as an enantiomeric insecticide in this article, since that chemical doesn’t have an asymmetric carbon and therefore can’t exist in “mirror forms.”

Gordon W. Gribble
Hanover, N.H.

DDT is a mixture of three forms of the chemical, one of which has enantiomers—not due to the presence of an asymmetric carbon but the relative position of the chlorine atoms on each of the molecule’s two benzene rings .—A. Goho