text: The biosynthetic pathways leading to the major classes of natural products are described below.
  * Photosynthesis or gluconeogenesis → monosaccharides → polysaccharides (cellulose, chitin, glycogen etc.)
  * Acetate pathway → fatty acids and polyketides
  * Shikimate pathway → aromatic amino acids and phenylpropanoids
  * Mevalonate pathway and methyletrythritol phosphate pathway → terpenoids and steroids
  * Amino acids → alkaloids