((2,3-Dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)methylamino)methanesulphonic acid 50567-35-6 EINECS 256-627-7 Metamizol Metamizolum N-Methyl-N-(2,3-dimethyl-5-oxo-1-phenyl-3-pyrazolin-4-yl)aminomethanesulfosaeure