Pyrroles are components of larger aromatic rings, including the porphyrins of heme, the chlorins and bacteriochlorins[?] of chlorophyll, and the corrin ring of vitamin B12.
... - Jean-Pierre Beltoise[?], (France) 1973 - Jackie Stewart[?], (United Kingdom) 1974 - Ronnie Peterson[?], (Sweden) 1975 - Niki Lauda, (Austria) 1976 - Niki ...