A resting culture of Rhizopus arrhizus (ATCC 11145) transformed verrucarin A into 16-hydroxyverrucarin A, whereas R. arrhizus transformed verrucarin B into a mixture of 16-hydroxyverrucarin B and 3'-hydroxyverrucarin A. Relative to verrucarins A and B, the 16-hydroxy derivatives showed marked increases in activity, as tested in vivo against P388 mouse leukemia.
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Pavanasasivam et al. (1983) studied this question.
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