Carbon-13 NMR Spectrum of Bilirubin

Abstract
The structure of bilirubin and of bilirubin derivatives has been studied by various physical techniques, including optical spectroscopy(1,2), optical rotatory dispersion,(4) isotope exchange(5) and proton magnetic resonance spectroscopy(2,3,5). A good deal of chemical information on bilirubin is also available(6). The interpretation of most of the experimental results, however, have been inconclusive and different possible structures of the molecule could be shown to accommodate the experimental data.