1,2,3,4-Tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride
https://www.polycil.co.uk/shop/fm-in-da00ef7d-1234-tetramethyl-1234-cyclobutanetetracarboxylic-dianhydride-79477
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1,2,3,4-Tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride for polymer synthesis and chemical research. Available online.
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