Abstract
Abstract— Semi‐empirical potential energy calculations have been used to examine the stabilities of the proposed geometric isomers of bilirubin. The calculations show that for either of the dipyrrole moieties, the ‘anti‐E’ and ‘syn‐E’ planar conformations are sterically unacceptable. The most stable form of the E isomer has the two pyrrole rings almost at right angles and in this conformation there can be no π‐delocalisation between the rings.
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