The title compound crystallises with two independent molecules in the
asymmetric unit; monoclinic space group P2(1)/n with a = 10.063(8), b
= 23.015(15) and c = 12.938(10) Angstrom; beta = 111.42(6)degrees V =
2789(4) Angstrom(3) and Z = 8. Steric compression between the two meth
yl groups and the adjacent bay region hydrogens distorts the molecules
from planarity and imparts handedness. The space group is centrosymme
tric and the lattice is therefore racemic.