4,4'-(Ethyne-1,2-diyl)diphthalic Anhydride
https://www.boropharm.com/shop/fm-in-da009wpq-44-ethyne-12-diyl-diphthalic-anhydride-82562
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Ethynyl Diphthalic Anhydride, chemical for high-performance polymers, epoxy resins, and lab research. Lab-grade quality.
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