isomeric

[ ahy-suh-mer-ik ]

/ ˌaɪ səˈmɛr ɪk /

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adjective

of, relating to, or displaying isomerism.

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Origin of isomeric

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

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

When two different bodies, like the above, have the same composition, they are said to be isomeric.
A Dictionary of Arts, Manufactures and Mines|Andrew Ure
Owing to the structure of the naphthalene molecule there are two isomeric naphthols, whereas there is only one phenol.
Coal|Raphael Meldola
Three isomeric phthalic acids are known, but only one of these is of use in the present branch of manufacture.
Coal|Raphael Meldola
It corresponds to tartaric acid, and, like this substance, it occurs in four stereo-isomeric forms.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7|Various

Dear Gould,—I feel like a white granular mass of amorphous crystals—my formula appears to be isomeric with Spasmotoxin.
The Life and Letters of Lafcadio Hearn, Volume 1|Elizabeth Bisland