Propanedinitrile,2,2'-(2,3,5,6-tetrafluoro-2,5-cyclohexadiene-1,4-diylidene)bis-, compd.with5-(5,6-dihydro-1,3-dithiolo[4,5-b][1,4]dithiin-2-ylidene)-7-(1,3-dithiol-2-ylidene)-5,7-dihydrofuro[3,4-b]pyrazine (1:1)