1 509 4-bromo-3-(carboxymethoxy)-5-phenylthiophene-2-carboxylic acid 1.000 2 694 4-bromo-3-(carboxymethoxy)-5-(4-hydroxyphenyl)thiophene-2-carboxylic acid 0.952 3 024 4-bromo-3-(carboxymethoxy)-5-[3-(cyclohexylamino)phenyl]thiophene-2-carboxylic acid 0.741 4 910 5-[3-(benzylamino)phenyl]-4-bromo-3-(carboxymethoxy)thiophene-2-carboxylic acid 0.714 5 512 4-bromo-3-(carboxymethoxy)thiophene-2-carboxylic acid 0.700 6 JMG 5-phenylthiophene-2-carboxylic acid 0.700