| Abstract
| - The molecular structure of a tetrahydrotetrol that was formed by the hydrolysis of 8α, 9β-dihydroxy-10β, 11β-epoxy-8,9,10,11-tetrahydrobenz[a]anthracene has been determined by using X-ray single crystal analysis, and refined to a final discrepancy index R of 0.0684. The data show that the relative arrangement of the four hydroxyl groups is 8α, 9β, 10β, 11α and that the tetra-hydrobenzene ring has a half-chair pucker. Two of the hydroxyl groups are axial (O8 and O9) and two are equatorial (O10 and O11).
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