Compound 12 showed very similar 1H and 13C NMR spectroscopic data to those of 11. The major difference observed was the smaller J value of the olefinic protons (J H7″,H8″ = 12.6 Hz), showing that 12 contains acis-p-coumaroyl moiety.
Thus, the structure of12(cis-glanduloidin F) was determined as (1S,2R)-2-hydroxycyclohexyl-6′-O-cis-p-coumaroyl-β-D-glu-copyranoside