The structure of spirilloxanthin (rhodoviolascin) was unambiguously determined by degradative and nuclear magnetic resonance spectral studies. Similar studies indicated the structures of chloroxanthin, spheroidene (“Pigment Y”), and spheroidenone (“Pigment R”); these structures have been confirmed by total syntheses.
M. S. Barber, L. M. Jackman, P. S. Manchand and B. C. L. Weedon, J. Chem. Soc. C, 1966, 2166 DOI: 10.1039/J39660002166
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