New norterpenoids and a sphingolipid from Carissa opaca.

Chemical investigations on the aerial parts ofCarissa opacaresulted in the isolation and characterization of two newnor-triterpenoids (compounds1and2) and a new sphingolipid (compound3) together with six known compounds. The structures of all the isolates were established using spectral data. All the isolated compounds showed DPPH radical scavenging and enzyme inhibitory activities against enzymes acetylcholinesterase, butyrylcholinesterase, and lipoxygenase. [ABSTRACT FROM AUTHOR]