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A number of hydroxylated diterpenoids were obtained from the microbial transformation of isosteviol lactone (4α-carboxy-13α-hydroxy-13,16-seco-ent-19-norbeyeran-16-oic acid 13,16-lactone) (2) with Mucor recurvatus MR 36, Aspergillus niger BCRC 31130, and Absidia pseudocylindrospora ATCC 24169. Incubation of 2 with M. recurvatus and Asp. niger led to isolation of seven known compounds (1 and 3–8)....
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