Bis(cyclopentadienyl) osmium(II) CMI Part 4027 Bis(cyclopentadienyl) osmium(II) CAS Number1273-81-0 Molecular Weight320.40 Molecular FormulaOs(C5H5)2 Synonyms (1) Osmocene(2) Cp2Os Download Specifications PDF Download Specifications PDF Request A Quote For all quote requests, please email Sales@colonialmetals.com or call 410.398.7200