Einecs 281-338-8

3-ethyl 4,5-dihydro-1-(4-methyl-2-sulphophenyl)-5-oxo-1H-pyrazole-3-carboxylate

2-[(3-Ethoxycarbonyl-4,5-dihydro-5-oxo-1H-pyrazol)-1-yl]-5-methylbenzenesulfonic acid