Gebreyesus, Dr. TarekegnShewaye, Dejene2022-01-282023-11-092022-01-282023-11-091989-06http://etd.aau.edu.et/handle/12345678/29760Hcteronemin , a pentacyclic sestcrterpene has been Characterized from the Chloroform extr act of an unidentified sponge sample collected f rom Mas sawa, Red Sea . the Structure was established by 1H nmr, 13C nmr , and mass spetral interpretation. Another C29 compound characterized as B- sitosterol , has been isolated from the Chloroform extract of another unidenti f i ed sponge samp l e, collected from the same locality as the firs t one. Th e s truc t ure of the ste rol was characterized by spectral interpreta tion, and compa ring its physica l cons tants with authentic sample.enChemical InvestigationsThesis