however , when the coa ester of 3- ( 5-butyl-2-pyrimidinyl ) -3-hydroxypropionic acid was incubated in the presence of the mitochondrial or the microsomal fraction , the corresponding alpha beta-unsaturated and saturated metabolites were identified in both cases , suggesting that the microsomal fraction could not catalyze the condensation or the keto-reduction of these heteroaromatic carboxylic acids .
C0014898
ester
C0007066
carboxylic acids