Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class carbohydrates [Cn(H2O)n, etc.]
                 Class saccharides
                   Class monosaccharides - sugars
                     3.01.02 Class aldoses [H[CH(OH)]nC(=O)H (n>=2), etc.]
                     3.01.02 Class ketoses [H[CHOH]nC(=O)[CHOH]mH, etc.]
                     3.01.05 Class ketoaldoses
                     3.01.07 Class amino sugars
                     3.01.09 Class aldonic acids [HOCH2[CH(OH)]nC(=O)OH]
                     3.01.10 Class ketoaldonic acids
                     3.01.11 Class uronic acids
                     3.01.12 Class aldaric acids [HOC(=O)[CH(OH)]nC(=O)OH]
                     3.05.1 Class "furanoses"
                     3.05.1 Class "pyranoses"
                     3.17 Class enoses