You will find articles on this page concerning pharmaceuticals organic fertilisers epoxy resins petrol and diesel Pharmaceuticals. Pharmaceutical compounds are increasingly designed to target particular receptors in tissues, based on known molecular structures. The compound is 'recognised' by the target tissue. Molecular recognition employs structural features called pharmacophores, that are often similar to structures found in natural materials. An example is salbutamol, used as a bronchodilator to alleviate the symptoms of asthma.
Noradrenaline is the natural bronchodilator, but it also increases heart rate and blood pressure.
Salbutamol does not. Covalent compounds will favour fatty tissue. No detailed knowledge of particular pharmaceutical compounds is expected. This contrasts with inorganic fertilisers such as ammonium nitrate and ammonium sulphate. These have a rapid action but for osmotic reasons can cause burning and foliage decay in some plants.