Colouring matters of the Aphidoidea. XLIII. Crystal structure of the aphid pigment 'Quinone A'

Abstract

The crystal structure of the quinone A, C₁₅H₁₄O₆, derived from protoaphin-fb, has been determined by single-crystal X-ray diffraction at 295 K and refined by least squares to a residual of 0.051 for 758 ?observed? reflections. Crystals are monoclinic, P2₁, a 5.239(4), b 16.551(9), c 7.920(8) Ǻ, β 108.92(6)°, Z 2. The structure determination confirms that proposed chemically, including the chirality of all asymmetric centres in the molecule.