soluble chemical derivatives of chitin and chitosan including ethylene glycol chitin , nitrous acid-modified chitosan , glycol chitosan , and chitosan oligomers , produced from chitosan by limited hydrolysis with hcl , were found to possess proteinase inhibitor inducing activities when supplied to young excised tomato ( lycopersicon esculentum var bonnie best ) plants .
C0008141
chitin
C0162969
chitosan