Kazushi Shingu

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Tetrahedron Letters | 1988

Kenji Yoshida; Kazushi Shingu; Shoji Yahara; Toshihiro Nohara; Nobuyuki Marubayashi; Ikuhiko Ueda; Kazumoto Miyahara; Toshio Kawasaki

Abstract The structures of two new C 28 steroidal lactone glycosides have been established; Spectroscopic and X-ray diffraction analyses of tubocapsigenin A diacetate, one of sapogenol derivative of these glycosides, have presented a new class of steroidal lactone structure.

Phytochemistry | 1994

Kazushi Shingu; Hiroshi Fujii; Kouichi Mizuki; Ikuhiko Ueda; Shoji Yahara; Toshihiro Nohara

Six new ergostane glycosides, designated as petunioside A, petunioside B, 24-epipetunioside B, petunioside C, 24-epipetunioside C and petunioside D, were isolated from the methanolic extract of the fresh aerial parts of Petunia hybrida. Their structures were determined by means of spectroscopic analysis and single crystal X-ray analysis.

Tetrahedron Letters | 1992

Kazushi Shingu; Koji Mito; Shoji Yahara; Toshihiro Nohara; Masateru Ono; Toshio Kawasaki; Kimiko Nakano; Toshiaki Tomimatsu; Mamoru Haratake; Nobuhiro Marubayashi; Ikuhiko Ueda

Abstract A novel cholestane glycoside, helojaposide ( 1 ), was obtained from Heloniopsis japonica. 1 exhibits an inhibitory activity for the root growth of rice.

Planta Medica | 1996