can't read?
Chitin ( gr. Χιτών Chitón , shell ', Panzer') is in addition to cellulose , the most widespread polysaccharide and is used to structure formation. It differs from cellulose by an acetamide group
C 1905 (OTTO) Chitin, pract Cas 1398-61-4 - used to study the formation and physicochemical properties of arthropod exoskeletons.