@article{oai:nitech.repo.nii.ac.jp:00004120,
 author = {Makino, Bunsho and Kawai, Masao and Yamamoto, Tatsuo and Yamamura, Hatsuo and Butsugan, Yasuo and Hayashi, Mitsuo and Ogawa, Koji},
 issue = {19},
 journal = {Journal of the Chemical Society. Chemical communications},
 month = {Jan},
 note = {Activated charcoal treatment of physalin B, a 13,14-seco-16,24-cyclosteroidal constituent of Physalis alkekengi, in MeOH at room temperature yields a product possessing a hydroxy group at the or-position of the b-Iactone carbonyl function, namely 25-hydroxyphysalin B, in high yield., application/pdf},
 pages = {1430--1431},
 title = {Activated  charcoal-mediated hydroxylation under very mild conditions: Conversion of physalin B into 25-hydroxyphysalin B},
 volume = {1992},
 year = {1992}
}