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  • Title: SNF4435C and D, novel immunosuppressants produced by a strain of Streptomyces spectabilis. II. Structure elucidation.
    Author: Takahashi K, Tsuda E, Kurosawa K.
    Journal: J Antibiot (Tokyo); 2001 Jul; 54(7):548-53. PubMed ID: 11560372.
    Abstract:
    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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