three isomeric ceramide tetrasaccharides -- p blood-group active globoside , lacto-n-neotetraosyl ceramide as abh blood-group precursor , both isolated from human erythrocytes and `` '' asialo ganglioside '' '' from human brain as reference standard -- and two ceramide pentasaccharides -- h blood-group active glycosphingolipid , obtained from blood-group b active ceramide hexasaccharide of human b erythrocytes after alpha-galactosidase treatment and ceramide pentasaccharide from rabbit erythrocytes with b-like blood-group activity -- were investigated by mass spectrometry after permethylation .
C0017647
globoside
C0007745
ceramide