Rapheephat Suvannakad

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A novel cyclodepsipeptide, cordycommunin (1), and two dihydroisocoumarins (2 and 3) were isolated from the insect pathogenic fungus Ophiocordyceps communis BCC 16475. The absolute configurations of the amino acid residues of 1 were addressed by application of Marfey's method. Cordycommunin (1) showed growth inhibition of Mycobacterium tuberculosis H37Ra(More)
Two new hirsutane sesquiterpenes, connatusins A (1) and B (2), were isolated from the fungus Lentinus connatus BCC 8996. The structures, closely related to hypnophilin, were elucidated on the basis of the spectroscopic data. An X-ray analysis was performed to confirm the structure of 1. Six known compounds were also obtained. Panepoxydone (5), panepoxydione(More)
Eleven substances including naphthalenones, naphthoquinones, unsymmetrical naphthoquinone dimers and a chlorinated diphenyl ether, three of which are new, have been isolated from the fungus Phaeosphaeria sp. The absolute stereochemistry of naphthalenones has been determined by the Mosher and exciton chirality methods. The biological activity of these(More)
Deoxypreussomerin derivatives, palmarumycins JC1 (1) and JC2 (2), and two dimeric naphthoquinones, isodiospyrin (3) and its new derivative isodiospyrol A (4), were isolated from dried fruits of Diospyros ehretioides. Structures of the isolated compounds were elucidated by spectroscopic analyses. Palmarumycins were not found in the extract of freshly(More)
Two new hirsutane sesquiterpenes, connatusins A (1) and B (2), were isolated from the fungus Lentinus connatus BCC 8996. The structures, closely related to hypnophilin, were elucidated on the basis of the spectroscopic data. An X-ray analysis was performed to confirm the structure of 1. Six known compounds were also obtained. Panepoxydone (5), panepoxydione(More)
AIMS Fungicide resistance now exists in the rice blast fungus, Magnaporthe grisea, necessitating the need for new active agents. Fungi isolated from habitats in Thailand were screened with reference to this problem. METHODS AND RESULTS A new, reliable in vitro screening system based on a microdilution plate format was set up using a virulent strain of M.(More)
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