Use of 13C in biosynthetic studies. Location of isotope from labelled acetate and formate in the fungal tropolone, sepedonin, by 13C nuclear magnetic resonance spectroscopy

Abstract
The 13C labelling patterns in sepedonin (3,6,9-trihydroxy-3-methyl-1,3,4,7-tetrahydrocyclohepta[c]-pyran-7-one) isolated from cultures of Sepedonium chrysospermum fed [1-13C]acetate, [2-13C]acetate, and [13C]formate have been elucidated by 13C nuclear magnetic resonance (13C n.m.r.) spectroscopy.

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