Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class esters [acyl-XR, etc.; R'kE(=O)l(OH)m (l≠0; ≥1 (OH):=(XR)), etc.; X=O,S,Se,Te,etc.; R≠H]
                 Class glycerides
                   1 Class 1-monoglycerides [RC(=O)OCH2CH(OR)CH2OR]
                   2 Class 2-monoglycerides [ROCH2CH(OC(=O)R)CH2OR]
                   3 Class 1,2-diglycerides [RC(=O)OCH2CH(OC(=O)R)CH2OR]
                   4 Class 1,3-diglycerides [RC(=O)OCH2CH(OR)CH2OC(=O)R]
                   5 Class triglycerides [RC(=O)OCH2CH(OC(=O)R)CH2OC(=O)R]