1. Program for Collaborative Research in the Pharmaceutical Sciences and Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, Research Center for Chemistry, Indonesian Institute of Science, Serpong, 15310 Tangerang, Indonesia, Herbarium Bogoriense, Research Center for Biology, Indonesian Institute of Science, Bogor, Indonesia, and Bristol-Myers Squibb, Pharmaceutical Research Institute, P.O. Box 4000, Princeton, New Jersey 08543