the positive ion spectra obtained from primary prostaglandins such as pge1 pge2 , 19-ohpge1 , 19-ohpge2 , pgf2 alpha , pgd2 , 6-keto-pgf1 alpha and from leukotriene b4 are very simple , with base peaks corresponding to ions arising from the loss of h2o from the ( m + h ) + and ( m + nh4 ) + ions , except for pgb2 and pgf2 , where the latter two ions predominate .
C0033554
prostaglandins
C0012472
pge2