IUPAC:3'-{2-[1-(3,4-dimethylphenyl)-3-(13C)methyl-5-oxo-4,5-dihydro(3,4,5-13C3)-1H-pyrazol-4-ylidene]hydrazin-1-yl}-2'-hydroxy-[1,1'-biphenyl]-3-carboxylic acid
IUPAC:3'-{2-[1-(3,4-dimethylphenyl)-3-(13C)methyl-5-oxo-4,5-dihydro(3,4,5-13C3)-1H-pyrazol-4-ylidene]hydrazin-1-yl}-2'-hydroxy-[1,1'-biphenyl]-3-carboxylic acid