Partial Hydrolysis of 5. An aqueous solution (1 mL) of 5 (1 mg) was heated in a boiling water bath for 2 h. The reaction mixture was analyzed by reversed-phase HPLC (solvent C) to exhibit the peaks due to castavaloninic acid (24), cornusiin B (25), 4,6-(S)-HHDP-D-glucose (26), gemin D (27), and camel- liatannin H (28).