Crustecdysone (I) is degraded by a lysed mycelium of the micro-organisms Rhizopus arrhizus, Rhizopus nigricans and Curvularia lunata to give poststerone (VI) which is then transformed into rubrosterone (VIII); makisterone A (II) behaves similarly, muristerone A (III) gives a new product, identified as 5β,11α-dihydroxy-poststerone (VII), and ecdysone (IV) is not affected by these micro-organisms.
L. Canonica, B. Danieli, G. Palmisano, G. Rainoldi and B. M. Ranzi, J. Chem. Soc., Chem. Commun., 1974, 656 DOI: 10.1039/C39740000656
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