Biosynthesis of ochratoxin A by Aspergillus ochraceus Wilh. was investigated by radiolabeling experiments in which phenylalanine-1-(14)C and sodium acetate-2-(14)C were supplied to the fungus in sucrose-yeast extract medium. Results showed that phenylalanine was incorporated unaltered into the phenylalanine moiety of ochratoxin A, whereas the isocoumarin moiety of ochratoxin A was mostly derive...

objectives: securinega virosa roxb (ex willd) baill (euphorbaiceae) root bark has been reportedly used in african traditional medicine in the management of mental illnesses. previously, the sleep-inducing potential of the crude methanol root bark of securinega virosa extract and its butanol fraction have been reported. the study aimed to isolate and characterize the bioactive constituent that m...

The title compound, C(13)H(12)Cl(2)O(5), is an isocoumarin compound which has been isolated from the ethyl acetate extract of the fermentation broth of actinomycete Streptomyces sp. (V(4)) from the South China Sea. There are intra- and inter-molecular hydrogen bonds and halogen bonds [Cl⋯Cl = 3.434 (2) Å; C-Cl⋯Cl = 121.6°]. The intermolecular O-H⋯O hydrogen bonds link mol-ecules into chains alo...