Sub Group: Heterocyclic Compounds Catalog Number: 12695 Formula: C5H2ClNO3S CAS Number: 39978-57-9 Molecular Weight: 191.59 Synonyms: 5-Nitro-2-thenoyl Chloride5-Nitro-2-thiophenecarbonyl Chloride5-Nitrothiophene-2-carboxylic Acid Chloride5-Nitrothiophene