| http://www.w3.org/ns/prov#value | - Additionally, this copolymer can be copolymerized with other monomers such as acrylonitrile, vinylimidazole, vinylhistidine, vinylpyrazine or diaminodiphenylmethane in a range that it is pharmaceutically acceptable and does not lose the effect. [0024] Illustrative of such a weakly basic anion exchange resin is, for example, Ionac A-365 (trade name; Sybron Chemicals Co.) which is being marketed wit
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