简介:Acontinuingphytochemicalstudyonthesemi-mangroveplantHibiscustiliaceusyieldedtwonewtetracyclictriterpenoids(3b,24S)-19(10!9)-abeo-8a,9b,10a-eupha-5,25(26)-dien-3,24-diol(tiliacolA,1),and(3b,23Z)-19(10!9)-abeo-8a,9b,10a-tircalla-5,23-dien-3,25-diol(tiliacolB,3),togetherwithoneknownanalog(2).Theirstructureswereelucidatedonthebasisofextensivespectralanalyses(MS,IR,1DNMRand2DNMR)andcomparisonwithliteraturecompounds.Compound2showedpotentcytotoxicityagainstbothP388andHeLacellswithIC50valuesof11.2mmol/Land11.5mmol/L,respectively.