Abstract
On the basis of nuclear magnetic resonance measurements and in agreement with recently reported mass-spectrometric investigations it is shown that the molecular formulae of Helvolic acid and Cephalosporin P1 must be revised to C33H44O8 and C33H50O8 respectively, and that the additional carbon atom is present as an angular methyl group. A comparison with the data obtained with fusidic acid points to a similarity among the three substances which is closer than hitherto suspected.
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