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Blank, G. E., Pletcher, J., & Sax, M. (1971). The molecular structure of firefly D-(−)-luciferin: A single crystal x-ray analysis. Biochemical and Biophysical Research Communications, 42(3), 583–588. doi:10.1016/0006-291x(71)90411-6 
10.1016/0006-291x(71)90411-6