@article{oai:nagasaki-u.repo.nii.ac.jp:00000807,
 author = {Orejola, Joanna J. and Era, Manami and Matsuo, Yosuke and Saito, Yoshinori and Tanaka, Takashi},
 issue = {21},
 journal = {Tetrahedron},
 month = {Apr},
 note = {Nupharanin (1), the first ellagitannin with dehydrohexahydroxydiphenoyl esters at the 1,4-positions of a-D-glucose, was isolated from the fresh rhizome of Nuphar japonicum. Based on spectroscopic evidence,the structure was determined to be 1,4-(S)-dehydrohexahydroxydiphenoyl-2-galloyl-3,6-(R)-hexahydroxydiphenoyl-
a-D-glucopyranose. The structure was supported by spectroscopic studies of acetonyl derivatives of 1 and its partial hydrolysate. In addition, unusual oxidative cleavage of the hydrated cyclohexenetrione ring of 1 was observed on moderate heating at 50  C in pH 6 buffer., Tetrahedron, 76(21), art.no.131204; 2020},
 title = {Nupharanin, the first ellagitannin with 1,4-dehydrohexahydroxydiphenoyl-α-d-glucopyranose from Nuphar japonicum},
 volume = {76},
 year = {2020}
}