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The X-ray structure of highly estrogenic (-)-(Z)-bisdehydro- doisynolic acid, obtained via the L-menthyl ester of its 3-methyl ether, i.e. L-menthyl (-)-(1R,2S)-1-ethyl-7-methoxy-2-methyl-1,2,3,4-tetrahydrophenanthrene-2-carboxylate, shows that its configuration is 1R,2S and its three fused rings are nearly coplanar.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, QB0088

hkl

Structure factor file (CIF format)
Contains datablock shelxl

CCDC reference: 131220

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