enantiomer
C2CEFR level
97/100Rarity: very rare
TechnicalRegister
One of a pair of molecules that are non-superimposable mirror images of each other.
Only one enantiomer of the drug is pharmacologically active, while the other is inert or toxic.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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