Chemical constituents from <i>Piper wallichii</i> Yan-Ni Shi Lian Yang Jin-Hua Zhao Yi-Ming Shi Yan Qu Hong-Tao Zhu Dong Wang Chong-Ren Yang Xing-Cong Li Min Xu Ying-Jun Zhang 10.6084/m9.figshare.1286777.v3 https://tandf.figshare.com/articles/journal_contribution/Chemical_constituents_from_i_Piper_wallichii_i_/1286777 <div><p>Fifteen known compounds including four triterpenoids (<b>1</b>–<b>4</b>), one sterol (<b>5</b>), one diketopiperazine alkaloid (<b>6</b>) and nine phenolics (<b>7</b>–<b>15</b>) were isolated from the stems of <i>Piper wallichii</i>. Their structures were elucidated by means of spectroscopic analysis, and acidic hydrolysis in case of the 2-oxo-3β,19α,23-trihydroxyurs-12-en-28-oic acid β-D-glucopyranosyl ester (<b>1</b>). The structure of compound <b>1</b> was fully assigned by 1D and 2D NMR experiments for the first time. All isolates were tested for their antibacterial, antifungal, anti-inflammatory and antiplatelet aggregation bioactivities.</p></div> 2015-07-27 08:21:34 phenolic alkaloid sterol analysis acid chemical oxo acidic antifungal 2 D NMR experiments antiplatelet aggregation bioactivities triterpenoid spectroscopic ester compound constituent diketopiperazine hydrolysis Piper wallichii