Unusual C25 steroid isomers with bicyclo[4.4.1]A/B rings from a volcano ash-derived fungus Penicillium citrinum.

@article{Du2008UnusualCS,
  title={Unusual C25 steroid isomers with bicyclo[4.4.1]A/B rings from a volcano ash-derived fungus Penicillium citrinum.},
  author={Lin Du and Tianjiao Zhu and Yuchun Fang and Qianqun Gu and Weiming Zhu},
  journal={Journal of natural products},
  year={2008},
  volume={71 8},
  pages={1343-51}
}
Eleven new unusual C25 steroid isomers with bicyclo[4.4.1]A/B rings, 24- epi-cyclocitrinol (1), 20-O-methyl-24-epi-cyclocitrinol (3), 20-O-methylcyclocitrinol (4), 24-oxocyclocitrinol (7), 12 R-hydroxycyclocitrinol (8), neocyclocitrinols B (10) and D (12), erythro-23-O-methylneocyclocitrinol (13), threo-23-O-methylneocyclocitrinol (14), isocyclocitrinol B (15), and precyclocitrinol B (18), and five known steroids, cyclocitrinol (2), neocyclocitrinols A (9) and C (11), isocyclocitrinol A (16… CONTINUE READING