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.
... (Brazil) 1991 - Ayrton Senna, (Brazil) 1992 - Ayrton Senna, (Brazil) 1993 - Ayrton Senna, (Brazil) 1994 - Michael Schumacher, (Germany) 1995 - Michael Schumacher, ...