A new coumarin derivative from the stems of the endangered plant <i>Ulmus elongata</i> ZhouQi WuShou-Yuan JiangChun-Xiao TongYing-Peng ZhaoTing ZhangBin NongXu-Hua JinZe-Xin HuJin-Feng 2020 <p>A preliminary phytochemical investigation of the stems of the endangered plant <i>Ulmus elongata</i> led to the isolation of a new coumarin derivative (named ulmuselactone A, <b>1</b>) and eight known compounds (<b>2</b>-<b>9</b>). The new structure was elucidated by detailed analysis of comprehensive spectroscopic methods, and its absolute configuration was established by comparing experimental and calculated electronic circular dichroism (ECD) spectra. The isolated compounds were evaluated for their antibacterial activities.</p> <p></p>