[2,2']Bi[[1,3]diselenolylidene]
2-methylthio-3-(2-methoxycarbonylethylthio)tetraselenafulvalene
2,6(7')-bis(methylthio)-3,7(6')-bis(2-methoxycarbonyethylthio)tetraselenafulvalene
2,3-Bis[(2-methoxycarbonyl)ethylseleno]-tetraselenafulvalene
2,3,6,7-Tetrakis[(2-methoxycarbonyl)ethylseleno]-tetraselenafulvalene