[2,2']Bi[[1,3]diselenolylidene]
2-methylthio-3-(2-methoxycarbonylethylthio)tetraselenafulvalene
2,6(7')-bis(methylthio)-3,7(6')-bis(2-methoxycarbonyethylthio)tetraselenafulvalene
tetramethyltetraselenafulvalene
2,3-dimethyl-6-methylthio-7-(2-methoxycarbonylethylthio)-tetraselenafulvalene