(5,6-Dihydro-[1,3]dithiolo[4,5-b][1,4]dithiin-2-yl)-phosphonic acid dimethyl ester 、 5a,6,9,9a-Tetrahydro-6,9-methano-benzo[g]quinoxaline-5,10-dione 以50%的产率得到5,10-Bis-(5,6-dihydro-[1,3]dithiolo[4,5-b][1,4]dithiin-2-ylidene)-5,5a,6,9,9a,10-hexahydro-6,9-methano-benzo[g]quinoxaline