“…The BuOH fraction from the MeOH extract of the whole plant of P. japonica yielded 5 new compounds (4, 5, 7, 8, 10) upon column chromatographic separation, together with 7 known compounds, 5 phenolic glycosides, androsin (2), 17) (Ϫ)-syringaresinol glucoside (3), 18) homoarbutin (6), 4,10) hyperin (11), 4,5,12) pirolatin (12) 8,9) together with an iridoid, monotropein (1) 4,7) and a naphthoquinone, chimaphilin (9). 3,5,6,19) TLC analysis of the acid hydrolysates of 4, 5, 7, 8, and 10 indicated the presence of glucose in 4, 5, 7, and 8, and glucose and xylose in 10.…”