U fiirso qoraalka hoose ka dibna ka jawaab su'aasha kadib isla luqadda qoraalka:  Qaab dhismeedka chitin waxaa go'aamiyay Albert Hofmann 1929. Chitin waa polysaccharide la beddelay oo ay ku jiraan nitrogen; waxaa laga soo saaray unugyada N-acetyl-D-glucosamine (si sax ah, 2- ((acetylamino) -2-deoxy-D-glucose). Halbeegyadaasi waxay sameeyaan xidhiidhka isku xidhka ah ee β-(1→4) (sida xidhiidhka u dhexeeya unugyada gulukooska ee sameeya cellulose). Sidaa darteed, chitin waxaa lagu tilmaami karaa inuu yahay cellulose oo hal koox hydroxyl ah monomer kasta lagu beddelay koox acetyl amine ah. Tani waxay u oggolaaneysaa kordhinta isku xidhka hydrogen ee u dhexeeya polymers-ka deriska ah, taasoo siineysa maaddada chitin-polymer xoogaa kordhay.  Su'aal: Waa maxay magaca polysaccharide-ka la beddelay ee uu Hofmann ogaaday 1929?
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