Browsing by Author "Shewaye, Dejene"

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    Chemical Investigations of Heteronema Erecta and an Unidentified Sponge from the Red Sea
    (Addis Ababa University, 1989-06) Shewaye, Dejene; Gebreyesus, Dr. Tarekegn
    Hcteronemin , 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.