these new metabolites were isolated and identified by chemical synthesis as the na- ( ( 4r ) -4- [ 4alpha- ( 2-carboxyethyl ) -3a alpha-hexahydro-7a beta-methyl-5-oxoindan-1 beta-yl ] -valeryl ) derivatives of l-alanine , glutamic acid , o-acetylhomoserine and glutamine , i.e . compounds ( iiia ) , ( iiib ) , ( iiid ) respectively .
C0061472
glutamic acid
C0017797
glutamine