Spiraeosides A and B, Two New Diterpenoid Glucosides from Spiraea japonica var. ovalifolia - Zuo, Guoying; He, Hongping; Shen, Yuemao; Xu, Xiaojie; Wang, Zheming; Yan, Chunhua; Hao, Xiaojiang (Planta Medica, 2009)