Toxicants from mangrove plants, VII. Vallapin and vallapianin, novel sesquiterpene lactones from the mangrove plant heritiera littoralis - D. Howard Miles; Vallapa Chittawong; 노동석; Allen Matthew payne; Armando A. de la Cruz; Edgardo D. Gomez; James A. Weeks; Jerry L. Atwood (1991)