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Fusarins G1/G2 (1/2) and G3/G4 (3/4), two sets of interesting examples of diastereoisomers with substantially identical NMR data, were discovered from natural products. The reason was discussed and the generally applicable determinant conditions were proposed. The minimum interval for stereoclusters to be entirely segregated was also discussed.
Three new isocoumarin derivatives, mucorisocoumarins A-C (1-3, resp.), together with seven known compounds, 4-10, were isolated from the cold-adapted fungal strain Mucor sp. (No. XJ07027-5). The structures of the new compounds were identified by detailed IR, MS, and 1D- and 2D-NMR analyses. It was noteworthy that compounds 1, 2, 4, and 5 were successfully… (More)
Two new naphthaline glucosides, 2-hydroxy-3-methoxy-8-methyl-1-O-β-d-glucopyranosylnaphthaline (1) and 1-hydroxy-3-methoxy-8-methyl-2-O-β-d-glucopyranosylnaphthaline (2), together with one new isocoumarin glucoside, 3-(3,3-dichloro-2-hydroxylpropyl)-6-methoxy-8-O-β-d-glucopyranosyl-1H-isochromen-1-one (3), were isolated from a cold-adapted fungal strain… (More)