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박유미(You Mi Park),장성기(Swong Ki Jang),김연수(Yeon Soo Kim),김박광(Bak Kwang Kim) 대한약학회 1991 약학회지 Vol.35 No.4
A benzofuran substance was isolated from the methanol extract of Pauownia tomentosa stem which has been used to treat against gonorrhoea and contusion etc. in the oriental traditional medicine. Its structure was elucidated as methyl-5-hydroxy-[1,4]naphthoquino-[2,3-b]benzo-[l,2-g]benzofuran-6-carboxylate by X-ray crystallography and various spectroscopic evidences and also other three known compounds, paulownin, sesamin, beta-sitosteryl-3-0-beta-D-glucopyranoside, were obtained.