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organic compounds
X-ray structure analysis of the title compound, C18H22O3, obtained under demethylation reaction conditions from 3-methoxy-17-p-toluenesulfonyloxy-16,17-secoestra-1,3,5(10)-triene-16-carbonitrile, revealed an unusual C/D junction. The molecules connected head-to-tail by bifurcated hydrogen bonds, forming twisted chains along the a axis.