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. 2019 Jun 11;17(6):349. doi: 10.3390/md17060349

Figure 3.

Figure 3

FTIR spectra of nostoxanthin (A) and nostoxanthin sulfate (B). In nostoxanthin sulfate, there is S=O sulfone stretching at 1216 cm−1, whereas in nostoxanthin, this was non-existent.