cal constituents from tiger's betel, Piper porphyrophyllum N.E.Br. (Fam. Piperaceae)

Emrizal Rajudin, Farediah Ahmad, Hasnah M. Sirat, Dayar Arbain and Hassan Y. Aboul-Enein

Natural Product Research Part A 24 ( 4 ): 387 - 390 , 2010