The useful enantiomer is able to be converted to the harmful enantiomer by mechanisms in the body.
An enantiomer refers to a type of optical isomer in which the two isomers are mirror images of each other. We know that an enantiomer can be able to rotate or change the direction of plane polarized light either to the right or to the left.
The fact that the harmful enantiomer can be found in the body after a long period of time implies that the compound have a long half life and is not readily excreted from the body.
Secondly, the fact that the harmful enantiomer was found in the body also mean that overtime, the useful enantiomer is able to be converted to the harmful enantiomer by mechanisms in the body.
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