Synonyms: (2R,3R)-(-)-2,3-BIS(DIPHENYLPHOSPHINO)BICYCLO[2.2.1]HEPT-5-ENE;(R,R)-NORPHOS;(-)-NORPHOS;(2R,3R)-(-)-2,3-BIS(DIPHENYLPHOSPHINO) B IC.(2.2.1)HEPT-5-EN;(2R,3R)-(-)-2,3-Bis(diphenylphosphino)-bicylo[2.2.1]hept-5-ene;(2R,3R)-(-)-2,3-Bis(diphenylphosphino)-bicyclo[2.2.1]hept-5-ene,min.95%(R,R)-NORPHOS;(2R,3R)-(-)-2,3-BIS(DIPHENYLPHOSPHINO)BICYCLO[2.2.1]HEPT-5-ENE (R,R)-NORPHOS;(1α,4α)-5β,6α-Bis(diphenylphosphino)bicyclo[2.2.1]hepta-2-ene