Abstract

By a combination, particularly, of 2H and 13C labelling it is shown that glycine is incorporated into the N-formyl group of tuberin (1) with stereospecific loss of the 2-pro-S proton whereas both C-2 protons are retained in the O-methyl group, but there is also non-stereospecific loss of both protons in the formation of both C1 groups; evidence is presented that the isonitrile carbon atoms in the xanthocillin (2) do not derive via the C1-tetrahydrofolate pool.

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