Fitoterapia. 2001 Nov; 72(7): 779-87.

Three diterpene glucosides and a diphenylamine derivative from Pieris formosa.

Wang LQ, Qin GW, Chen SN, Li CJ.

Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 294 Tai-Yuan Road, 200031, Shanghai, PR China.

Three new diterpenoids, pierisformosides G-I (1-3) and a diphenylamine derivative 4 have been isolated from the ethanol extract of Pieris formosa leaves, compound 1 being a new type seco-ring-A kaurane diterpene glucoside. Their structures were elucidated with the aid of NMR spectroscopy including two-dimensional-NMR techniques.