Abstract
The amounts of 4'-Chloro-5-methoxy-3-biphenylylacetic acid (DKA-9) and its metabolites (DKA-9G, DKA-24, DKA-24G, DKA-24OG and DKA-24S, see Chart 1) in human urine could be determined separately by measuring the amounts of DKA-9 and DKA-24 generated after hydrolizing under various conditions with gas-liquid chromatography.