organic compounds see [unranked] chemical compounds
   Class carbohydrates [Cn(H2O)n, etc.]
     Class monosaccharides - sugars
       1.1 Class aldoses [H[CH(OH)]nC(=O)H (n>=2), etc.]
       1.2 Class ketoses [H[CHOH]nC(=O)[CHOH]mH, etc.]
       2 Class amino sugars