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Zenichi Yoshida (1925-2023)
Zenichi Yoshida (1925-2023)
Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
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May 11, 2023
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Communication | Regular issue | Vol 55, No. 1, 2001, pp.29-32
Published online, 1st January, 1970■ Tetrameric and Pentameric Ellagitannins from Monochaetum multiflorum
Published online, 1st January, 1970
DOI: 10.3987/COM-00-9088
■ Tetrameric and Pentameric Ellagitannins from Monochaetum multiflorum
José H. Isaza M., Hideyuki Ito, and Takashi Yoshida*
*Faculty of Pharmaceutical Science, Okayama University, 1-1-1 Tsushima-naka, Okayama 700-8530, Japan
Abstract
Two new hydrolyzable tannins, nobotanin S (1) and melastoflorin A (2), were isolated from the leaves of Monochaetum multiflorum, and their structures were characterized as tetrameric and pentameric ellagitannins based on detailed NMR analyses using 2D-NMR techniques and chemical evidence. Melastoflorin A (pentamer) was notably the biggest molecule among numerous hydrolyzable tannins.
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