N-NITROSO-DI-ISO-PROPYLAMINE Malononitrile 3 5-DICHLOROPYRIDINE 1-OXIDE 98 3-Pyridinesulfonic acid 3-Chloropyridine pyridine-3-sulfonyl chloride 5-(2-Fluorophenyl)-1H-pyrrole-3-carbaldehyde 2'-Fluoroacetophenone 4-Pyridinesulphonic acid 5-(2-Fluorophenyl)-1-(pyridin-3-ylsulfonyl)-1H-pyrrole-3-carbaldehyde