... The aqueous layer was extracted with EtOAc (3 X 15 mL). The combined organic layers were dried (MgSO,) and concentrated under reduced pressure. ... 'Institute of Chemistry, Academia Sinica. * Providence College. ... 1986, 33, 13. (h) Tso, HH; Liu, LT; Lin, LC; Chou, T. S. J. Chin. ...