Before revision: Introduced by Pierre Franchomme in 1975 and formalized in the European Union in 2006 with the adoption of the regulation REACH, a chemotype (sometimes chemovar) is a chemically distinct entity in a plant or microorganism, with differences in the composition of the secondary metabolites.
After revision: A chemotype (sometimes chemovar) is a chemically distinct entity in a plant or microorganism, with differences in the composition of the secondary metabolites.