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Obituary
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
Editor
May 11, 2023
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Short Paper | Regular issue | Vol 96, No. 6, 2018, pp.1075-1079
Published online, 23rd May, 2018
Published online, 23rd May, 2018
DOI: 10.3987/COM-18-13895
■ Novel Antioxidant Isolated from Warcupiella spinulosa JCM 2358, 7-Hydroxycordylactam
Ryosuke Shigemoto, Ken-Ichi Oinuma, Shunsuke Masuo, and Naoki Takaya*
*Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
Abstract
We identified a new compound, 7-hydroxycordylactam, together with the known compound, cordylactam, from cultured Warcupiella spinulosa JCM 2358. Their structures were elucidated using high-resolution mass spectrometry and NMR spectroscopy. The spectra indicated that these compounds have a γ-lactam-fused γ-pyrone skeleton. Analysis of their antioxidant activities showed that both 7-hydroxycordylactam and cordylactam scavenged 1,1-diphenyl-2-picrylhydrazyl radicals with an IC50 of 340 µM.
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