isomeric

[ ahy-suh-mer-ik ]

/ ˌaɪ səˈmɛr ɪk /

of, relating to, or displaying isomerism.

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1830–40; <Greek isomer(ḗs) having equal parts (see iso-, -mere) + -ic

i·so·mer·i·cal·ly, adverbun·i·so·mer·ic, adjective

Three isomeric phthalic acids are known, but only one of these is of use in the present branch of manufacture.
Coal|Raphael Meldola
It is isomeric with atropine, and is converted into atropine by heating to 110°, or warming with alcoholic potash.
Poisons: Their Effects and Detection|Alexander Wynter Blyth
Muscarine is isomeric with betain and oxycholin, from which it is separated by its fluorescence and poisonous properties.
Poisons: Their Effects and Detection|Alexander Wynter Blyth
The constitution of the isomeric diazo hydroxides has given rise to much discussion.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4|Various

In presence of a trace of this substance, isomeric transformation very speedily occurs, and leads to the condition of equilibrium.
The Phase Rule and Its Applications|Alexander Findlay