Spiraeosides A and B, two new diterpenoid glucosides from Spiraea japonica var. ovalifolia.

Two new atisane-type diterpenoid glucosides, spiraeosides A (1) and B (2), were isolated from the aerial parts of Spiraea japonica L.f. var. ovalifolia. Their structures were characterized based on spectral analysis, and the structure of 1 was further confirmed by single-crystal X-ray diffraction.