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cif-access (organic compounds)
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.