Glucosyringic acid

Glucosyringic acid has immunosuppressive effect, it can inhibit the proliferation of murine B lymphocytes in vitro.Two new grayanane diterpenoid glucosides, rhodomosides A (1), B (2) and two new phenolic glycosides 3, 4 together with a known Glucosyringic acid (5) were isolated from the roots of Rhododendron molle G. Don (Ericaceae) . Their structures were elucidated on the basis of spectral analysis.