Abstract
Methyl bromogibberellate crystallises in the orthorhombic system, space group P212121, with four molecules of C20H23BrO6 in a unit cell of dimensions a= 10·74, b= 10·70, c= 16·64 A. The crystal structure was elucidated by the heavy-atom method and Fourier and least-squares methods were employed in the refinement of the atomic parameters. The analysis defines the absolute stereochemistry of gibberellic acid.
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