K. Peters et al., Crystal structure of 3 alpha,4 alpha-4 ',5 '-diphenyl-3-(phenylsulfonyl)-1R-[1 alpha,2(4'R*,5'R*)-spiro]bicyclo[2.2.1]hept-5-ene-2,2'[1-3]dioxolane, [(C6H5SO2)C7H7][C2H2O2(C6H5)(2)], Z KRIST-NEW, 215(2), 2000, pp. 231-232
C27H24O4S, orthorhombic, P2(1)2(1)2(1) (No. 19), a = 10.095(2) Angstrom, b
= 13.636(2) Angstrom, c = 16.425(2) Angstrom, V = 2762.6 Angstrom(3), Z = 4
, R-gt(F) = 0.047, wR(F) = 0.047, T = 293 K.