Glucosyringic acid

Planta Med. 2003 May;69(5):434-9.

Diterpenoid and phenolic glycosides from the roots of Rhododendron molle.[Pubmed: 12802725 ]

METHODS AND RESULTS:
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.
CONCLUSIONS:
Compounds 3, 4 and 5 were found to inhibit the proliferation of murine B lymphocytes in vitro, while compound 3 also showed stimulatory activity on the proliferation of murine T lymphocytes in vitro.

Zhong Yao Cai. 2014 May;37(5):807-11.

Chemical constituents of Eucommia ulmoides.[Pubmed: 25335288]

To study the chemical compositions of Eucommia ulmoides.
METHODS AND RESULTS:
The compounds were isolated and purified from Eucommia ulmoides by silica gel column chromatography, Sephadex LH-20, MPLC packed with MCI gel and semi-preparative HPLC. The structures of these compounds were established on the basis of spectral analyses (1H-NMR, 13C-NMR and MS). Thirteen compounds were obtained,and their structures were identified as betulin (1), syringin (2), pervoside A (3), Glucosyringic acid (4), vanillic acid-beta-glucoside (5), geniposide acid (6), aucubin (7), geniposide (8), pinoresinol-4,4'-di-O-beta-D-glucopyranoside (9), syringaresinol di-O-beta-D-glucopyranoside (10), medioresinol di-O-beta-D-glucopyranoside (11), sucrose (12), and ethyl beta-glucopyranoside (13) on the basis of physical characteristics and spectral data.
CONCLUSIONS:
Compounds 3 - 5, 12 and 13 are isolated from this plant for the first itme.