Cyclic condensation product from 4,4-dihydroxy-diphenylpropane and O-phthalic acid
K. Tyuzyo, Y. Harada, J. Suzuki
Journal of Polymer Science Part B: Polymer Letters
Volume 2 Issue 1, Pages 43 - 45
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http:/dx.doi.org/10.1002/pol.1964.110020111