Classification of organisms into different groups on the basis of different Chemicals present in their body is called chemotaxonomy
Chemotaxonomy is a system of classification which is based on the chemical constituents of the plants.

Chemotaxonomy is the identification and classification of organisms based on similarities and differences in biochemical composition. Cytotaxonomy can also be defined as the classification of organisms based on differences at the biochemical level especially in the amino acid sequences of common protein.
HelloThe method of biological classification based on similarities in the structure of certain compounds among the organisms being classified is called chemotaxonomy.