The X-ray structures of gibberellin A4 methyl ester and gibberellin A13 trimethyl ester have been determined. Ring A is flattened and the crowding of C(7) by C(18) and C(15) is greater in gibberellin A13 trimethyl ester when compared to gibberellin A4.
G. Ellames, J. R. Hanson, P. B. Hitchcock and S. A. Thomas, J. Chem. Soc., Perkin Trans. 1, 1979, 1922 DOI: 10.1039/P19790001922
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