Noun
English Wikipedia has an article on:bipyridineWikipedia
bipyridine (plural bipyridines)
(organic chemistry) Any of six isomeric bicyclic heterocycles consisting of two pyridine molecules directly linked; their derivatives have many industrial applications.
Bipyridine compounds (Paraquat-Gramoxone and Diquat) were discovered for herbicide use in 1954 by William Boon at ICI's Plant Protection division at Jealott's Hill, being released onto the market in 1958. Source: Internet