K. Peters et al., Crystal structure of 1,4-dimethyl-6H-benzo[b]naphtho[1,2-d]pyran-6-one, C10H6(COO)C6H2(CH3)(2), Z KRIST-NEW, 215(3), 2000, pp. 393-394
C19H14O2, orthorhombic, Pbca (No. 61), a = 13.526(1) Angstrom, b = 9.523(1)
Angstrom, c = 21.421(2) Angstrom, V = 7759.2 Angstrom(3), Z = 8, R-gt(F) =
0.059, wR(F) = 0.056, T = 293 K.