Prunioside A (1) has been isolated from an EtOAc-soluble extract of Spiraea
prunifolia var. simpliciflora by a combination of chromatographic techniqu
es. The structure was determined primarily by extensive NMR experiments. Co
mpound 1 is a unique terpene glycoside. Its acetylated derivative (1a) inhi
bited nitric oxide production in murine macrophage-like RAW 264.7 cells in
a dose-dependent manner.