The title compound crystallises in the triclinic system, space group P, with a= 14·485(2), b= 14·957(2), c= 10·360(1)Å, α= 92·81(6), β= 101·36(6), γ= 103·68(5)°, Z= 2. Least-squares refinement of atomic and thermal parameters, based on 2145 independent reflections measured on a diffractometer, converged to R 0·071. Three geometrically different pyrrole rings are observed and the stereochemical consequences of substitution at nitrogen are discussed.
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George M. McLaughlin (1974) studied this question.