Hossain M B, van der Helm D, Sanduja R, Alam M
Department of Chemistry, University of Oklahoma, Norman 73019.
Acta Crystallogr C. 1988 Jun 15;44 ( Pt 6):1022-4. doi: 10.1107/s0108270188000459.
C21H24O7, Mr = 388.4, orthorhombic, P2(1)2(1)2(1), a = 13.279 (10), b = 15.615 (10), c = 9.427 (8) A, V = 1954.7 A3, Z = 4, D chi = 1.319 g cm-3, lambda(Mo K alpha) = 0.71069 A, mu = 1.0 cm-1, F(000) = 824, T = 293 K, R = 0.049 for 1805 observed reflections. The gibberellane skeleton shows the conformational variety characteristic of many other gibberellin derivatives. Ring A is in a sofa conformation while the five-membered ring B assumes an intermediate conformation between an envelope and a half-chair. The lactone ring is in an ideal envelope conformation and shows a marked difference in its two C-O distances. Each molecule is hydrogen bonded to two others to form continuous spiral chains along the c axis.
C21H24O7，Mr = 388.4，正交晶系，P2(1)2(1)2(1)，a = 13.279 (10)，b = 15.615 (10)，c = 9.427 (8) Å，V = 1954.7 Å3，Z = 4，Dχ = 1.319 g cm-3，λ(Mo Kα) = 0.71069 Å，μ = 1.0 cm-1，F(000) = 824，T = 293 K，对于1805个观测反射，R = 0.049。赤霉烷骨架呈现出许多其他赤霉素衍生物特有的构象多样性。A环呈沙发式构象，而五元环B呈现出介于信封式和半椅式之间的中间构象。内酯环呈理想的信封式构象，其两个C - O距离存在明显差异。每个分子通过氢键与另外两个分子相连，沿c轴形成连续的螺旋链。
