You know what it looks like… but what is it called?
TAKE THE QUIZ“isophthalic”
We have one entry that includes the term isophthalic.
isophthalic acid
noun: a crystalline diacid C6H4(COOH)2 isomeric with phthalic acid made usually by oxidation of meta- xylene and used in making synthetic resins and esters for use as plasticizers; meta- benzene-dicarboxylic acid
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Merriam-Webster unabridged