Molecular structure of the eighteen-vertex selenaboraneanti-SeB17H19(3). Displacement ellipsoids for non-hydrogen atoms are drawn at a 50 % probability level. The molecule has crystallographic inversion symmetry at the mid-point of the B(5)-B(6) vector; hence the asymmetric unit is half a molecule and the molecule is disordered. Interatomic distances (A): B(5)-B(6), 1.784(4), B(6)-B(2) 1.765(3), B(6)-B(7) 1.816(3), B(7)-B(8) 1.946(3), B(5)-B(10) 1.953(3), Se(9)-B(4) 2.067(3), Se(9)-B(8) 1.983(3), Se(9)-B(10) 1.969(3).
