positional isomer


Also found in: Medical.

positional isomer

[pə′zish·ən·əl ′ī·sə·mər]
(chemistry)
One of a set of structural isomers which differ only in the point at which a side-chain group is attached.
(organic chemistry)
Constitutional isomer having the same functional group located in different positions along a chain or in a ring.
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Attorney's Office reports that the former University of Florida wide receiver pleaded guilty Wednesday to conspiracy to possess with intent to distribute a positional isomer of butylone, also known as ethylone, and commonly marketed as the street drug ''Molly.
In this work, the effects of a pair of positional isomer of ganoderic acids (GAs), namely ganoderic acid Mf (GA-Mf) and ganoderic acid S (GA-S) purified from the fermented mycelia of Ganoderma lucidum, on induction of cell apoptosis and the apoptotic pathway in HeLa cells were investigated.
It is ideal for structurally similar compounds including chiral entities, diastereomers, enantiomers, positional isomers and structural analogs.

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