C21H18O8	Z = 2
Mr = 398.35	F(000) = 416
Triclinic, P1	Dx = 1.406 Mg m−3
Hall symbol: -P 1	Melting point = 418–420 K
a = 9.4024 (16) Å	Mo Kα radiation, λ = 0.71073 Å
b = 9.8506 (17) Å	Cell parameters from 576 reflections
c = 11.1570 (18) Å	θ = 2.0–27.0°
α = 67.817 (3)°	µ = 0.11 mm−1
β = 80.300 (3)°	T = 293 K
γ = 89.683 (3)°	Prism, colourless
V = 941.3 (3) Å3	0.42 × 0.35 × 0.29 mm