New Optically Active Poly(ester-imide)s Derived from N N -(4 4 -Carbonyldiphthaloyl)-Bis-L-Phenylalanine Diacid Chloride

New Optically Active Poly(ester-imide)s Derived from N N -(4 4 -Carbonyldiphthaloyl)-Bis-L-Phenylalanine Diacid Chloride
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