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Structural backbone of various pharmaceutically acceptable carboxylate-terminated polymers evaluated in this study. CAP and HPMCP are phthalic acid containing polymers. HPMCP is available in three grades: HPMCP-50, HPMCP-55, and HPMCP-55S. Eudragit and Kollicoat are methcrylic acid and alkyl acrylate copolymers with different molecular weights and methacrylic acid (x) and alkyl acrylate (y) ratio.
