Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class carbohydrates [Cn(H2O)n, etc.]
                 chitin
                 1 Class saccharides
                 2.1 Class alditols [HOCH2[CH(OH)]nCH2OH]
                 2.2 Class inositols [~[CHOR]6~]
                 3.33.1 Class C-glycosyl compounds [glycosyl-hydrocarbyl]
                 3.33.1 Class glycosides [glycosyl-OR, -SR, -SeR, etc.]
                 3.33.1 Class glycosylamines [glycosyl-NR2]