1,5-Naphthalenedisulfonic acid, 3-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- 3-(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)naphthalene-1,5-disulphonic acid 6838-01-3 EINECS 229-926-5