9l:9d , 79:21 and 13l:13d , 9- and 13-hydroxyoctadecadienoates which had largely lost the tritium label ( 6 % and 7 % retention of tritium relative to precursor , respectively ) showing that the hydrogen which is removed from c-11 during the conversion has the l ( pro-s ) configuration .
C0041119
tritium
C0020275
hydrogen