... Tetrahedron: Asymmetry. ... Empirical formula, C 15 H 14 O 3 S. F W (g/mmol), 274.32; temperature (K), 190; wavelength (λ, Å), 0.7107; trigonal space group P 3(2), unit cell dimensions: a=b=9.5840(10) Å, c=12.9863(13) Å; volume (Å 3 ), 1033.0(2); Z, 3; density (calculated ...