A new salt of the electron-donor molecule BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene, or ET] with the unusual "T"-shaped anion Br2SeCN- was synthesized. Its crystal structure (space group P1, Z = 1; a = 5.9304(6) Angstrom, b = 8.8042(9) Angstrom, c = 16.509(2) Angstrom, alpha = 95.723(8)degrees, beta = 98.767(8)degrees, gamma = 92.192(8)degrees, V = 846.4(2)Angstrom(3) at 298 K; a = 5.8131(12) Angstrom, b = 8.666(2) Angstrom, c = 16.626(4) Angstrom, alpha = 93.75(2)degrees, beta = 100.62(2)degrees, gamma = 89.75(2)degrees, V = 821.4(3)Angstrom(3) at 122 K) contains layers of ET molecules interspersed with anion layers. A crystallographic phase transition at similar to 150 K is observed, accompanied by a discontinuity in unit cell angles. The band electronic structure calculation suggests the possibility of one-dimensional conduction, but electron localization renders the system semiconducting over the entire temperature range studied, Inductive techniques showed no sign of superconductivity at temperatures above 1.2 K and pressures below 5 kbar.