“…Furthermore, twelve compounds, 5-hydroxy-7,4′-dimethoxyflavone ( 4 ) [ 47 ], benzyl- β -D-glucopyranoside ( 9 ) [ 48 ], 1-(2,4,5-trimethoxyphenyl)-1,2-propanedione ( 13 ) [ 49 ], 1′,2′-dihydroxyasarone ( 14 ) [ 50 ], asaraldehyde ( 16 ) [ 51 ], trans - N -feruloyltyramine ( 18 ) [ 52 ], paprazine ( 19 ) [ 52 ], norcepharadione B ( 20 ) [ 53 ], aristolactam B II ( 22 ) [ 54 ], reseoside ( 29 ) [ 55 ], andamanicin ( 31 ) [ 56 ], and magnosalin ( 32 ) [ 56 ] were previously isolated from other Piper species such as P. capense L.f. [ 57 ], P. crocatum Ruiz & Pav. [ 58 ], P. cubeba L. [ 59 , 60 ], P. sumatranum (Miq.)…”