Partial Hydrolysis of 4. A solution of 4 (1 mg) in H2O (1 mL) was heated in a boiling water bath for 1 h. Normal- and reversed-phase HPLC (solvent B) showed peaks due to phillyraeoidin B (7), praecoxins A (20) and D (21), and 2,3- (S)-HHDP-D-glucose (22).