| 摘要 |
2074517 9209635 PCTABS00013 Modified chitins and chitosans with recurring units of formula (I), wherein R denotes -NH2, -NHCOCH3 and R', with R' being present in at least 30 % of the recurring units, characterized in that R' represents a group of formula (II) in a proportion of at least 90 %. Due to their favourable biological properties, these materials are advantageously useful in medical and cosmetical applications.
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