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            _____     ____      ______   _    _   
    ___    |  ___||  |  _ \\   /_   _// | || | || 
   /   ||  | ||__    | |_| ||   -| ||-  | || | || 
  | [] ||  | ||__    | .  //    _| ||_  | \\_/ || 
   \__ ||  |_____||  |_|\_\\   /_____//  \____//  
    -|_||  `-----`   `-` --`   `-----`    `---`   
     `-`

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Text this: 1H-NMR analysis of degree of substitution in N,O-carboxymethyl chitosans from various chitosan sources and types