Crude CH2Cl2-MeOH extracts prepared from Alangium javanicum and A. grisolleoides were found to induce DNA strand breakage in the presence of Cu2+ and were subjected to bioassay-guided fractionation to permit identification of the active principle (s). Javaniside (1), a novel alkaloid possessing an unusual monoterpenoid oxindole skeleton, was identified as an active principle contributing to the DNA cleavage activity observed for the ...