In organic chemistry, a pyrrole is a five membered aromatic ring, 4 elements of which are carbonatoms, one element of which is a nitrogen atom. The molecular formula for a pyrrole is C4NH5. The structure is:
... most famous role is that of the cranky professor forced to stay immobile because of a broken leg in 1942's The Man Who Came to Dinner[?], which he had performed onstag ...