Crystal data for 15-O-acetylacerinol and two related triterpenes isolated from Japanese Cimicifuga plants

Three triterpenes, 15-O-acetylacerinol, simplexyl acetate and O-methylcimiacerol have been obtained from Cimicifuga plants and recrystallized from ethyl acetate. 16-O-Acetylacerinol is tetragonal, space group P4₃2₁2 or P4₁2₁2, a = b = 7.7624 (7), c = 98.601 (8) Å, V = 5941.2 ų; simplexyl acetate is monoclinic, space group P2₁ or P2₁/m, a = 15.513 (2), b = 8.3691 (7), c= 11.444 (1) Å, β = 90.33 (4)°, V = 1485.7 ų; O-methylcimiacerol is orthorhombic, space group P2₁2₁2₁, a = 15.940 (4), b = 18.278 (6), c = 9.650 (3), V = 2811.5 ų. Full structure determinations are in progress.