SNF4435C and D are new immunosuppressants isolated from the culture broth of a strain of Streptomyces spectabilis. Their molecular formulas were determined as C28H31NO6 based on the HRFAB-MS analyses. The structures of SNF4435C and D were elucidated to be novel nitrophenyl pyrones having an intriguing tricyclic ring system and diastereoisomers of each other by spectroscopic analyses including various NMR measurements.
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Takahashi et al. (2001) studied this question.
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