The 1H- and 13C-nmr assignments of territrems A, B, and C [1-3] were made by using nOe and 2D nmr techniques. Following the same methods, the structure of MB2 [4], the major product of territrem B incubated with rat liver microsomal fraction, was determined as a hydroxylation product at the pro S methyl group of C-4 of territrem B.
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