
Keywords: CS; chitosan; DFT; density functional theory; FTBH; Formaldehyde tert-butyl hydrazone; HOBt; 1-Hydroxybenzotriazole hydrate; TBME; tert-Butyl methyl ether; TMSCN; Trimethylsilyl cyanide; Acetophenone (PubChem CID: 7410); Ethyl benzoylformate (PubChem CID: