653574-50-6

2-Pyridinecarboxylic acid,6-(carboxymethoxy)-5-[[[6-(carboxymethoxy)-5-[[[6-(carboxymethoxy)-5-nitro-2-pyridinyl]carbonyl]amino]-2-pyridinyl]carbonyl]amino]-, 2-methylester, compd. with sulfinylbis[methane] (1:4)