ent-Clerodane diterpenoids from the stems of Croton krabas.

The first phytochemical investigation from the stems of Croton krabas resulted in the isolation of three new ent-clerodane diterpenoids, crotonkrabases A-C (1-3), along with two known compounds, 12-oxohardwickiic acid (4) and crotonpyrone B (5). Their structures were elucidated using extensive spectroscopic methods. The structure of 3 was unambiguously proven by X-ray crystallography.

Bioactive galloyl flavans from the stems of .

Three new flavans, (2)-7--galloyl-5,3',4'-trihydroxyflavan (), (2)-7,3--digalloyl-5,4-dihydroxyflavan (), and (2)-7,4--digalloyl-5,3-dihydroxyflavan (), together with four known compounds, (2)-5,7,3',4'-tetrahydroxyflavan (), (-)-epicatechin (), (-)-syringaresinol (), and methyl gallate () have been isolated from the EtOAc extract of the stems of . Compounds and were obtained as a mixture of positional isomers. The structures of the isolated compounds were established using extensive spectroscopic data.

Mycotoxins from the Fungus Botryotrichum piluliferum.

Two new sterigmatocystin derivatives, oxisterigmatocystins E and F (1 and 2, respectively), along with nine known compounds, oxisterigmatocystins G and H (3 and 4, respectively), sterigmatocystin (5), N-0532B (6), O-methylsterigmatocystin (7), N-0532A (8), 6-O-methylversicolorin A (9), 6,8-O-dimethylversicolorin A (10), and 8-O-methylaverufin (11), were isolated from the fungus Botryotrichum piluliferum. The structures of these mycotoxins were elucidated by spectroscopic evidence. Among these, compounds 3, 4, and 9 were discovered as natural products for the first time.

Chevalone C analogues and globoscinic acid derivatives from the fungus Neosartorya spinosa KKU-1NK1.

Four meroterpenoids, 1-hydroxychevalone C, 1-acetoxychevalone C, 1,11-dihydroxychevalone C, and 11-hydroxychevalone C and two ester epimers, 2S,4S-spinosate and 2S,4R-spinosate, together with seven known compounds, chevalones B, C, and E, tryptoquivaline, nortryptoquivaline, tryptoquivaline L, and quinadoline A were isolated from the fungus Neosartorya spinosa. Their structures were established based on spectroscopic data analyses. The theoretical ECD spectra of epimers, 2S,4S-spinosate and 2S,4R-spinosate were calculated to support the experimental results of their CD spectra.

Bioactive depsidones from the fungus Pilobolus heterosporus.

A new aromatic ester, pilobolusate (1), four new depsidones, pilobolusones A-D (2-5), five known depsidones, (6-10), and ergosterol were isolated from the fungus Pilobolus heterosporus. Their structures were established on the basis of spectroscopic data. Compounds 2 and 4-9 showed cytotoxicity against three cancer cell lines (KB, MCF-7, and NCI-H187) with IC50 values in the range of 9.

Chemical constituents and biological activities from roots of Enkleia siamensis.

Chemical investigation from roots of Enkleia siamensis (Kurz) Nervling resulted in the isolation of 10 compounds. Their structures were established on the basis of 1D and 2D NMR spectroscopic data as linobiflavonoid (1), chamaejasmin (2), 7-O-β-D-glucopyranosylchamaejasmin (3), ormocarpin (4), (-)-wikstromol (5), matairesinol (6), (+)-lariciresinol (7), umbelliferone (8), daphnoretin (9) and carthamidin (10). Compounds 2 and 8 showed cytotoxicity against KB, MCF-7 and NCI-H187 cancer cell lines.