The structure (IIa) of fusicoccin H, a minor phytotoxic glycoside produced by Fusicoccum amydali, has been determined by degradative studies and by chemical correlation with the known fusicoccin series. Feeding experiments have shown that fusicoccin H can act as a precursor of fusicoccin. This strongly suggests that fusicoccin is a diterpenoid and not a degraded sesterterpenoid.
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Barrow et al. (1973) studied this question.