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WikiPedia: Ethinylestradiol http://www.chemspider.com/Chemical-Structure.5770.... http://www.drugs.com/international/ethinylestradio... http://adsabs.harvard.edu/abs/1938NW.....26...96I http://www.ema.europa.eu/ema/index.jsp?curl=/pages... http://www.accessdata.fda.gov/scripts/cder/daf/ http://www.accessdata.fda.gov/scripts/cder/drugsat... http://edocket.access.gpo.gov/2004/pdf/04-10194.pd... //www.ncbi.nlm.nih.gov/pmc/articles/PMC2864220 //www.ncbi.nlm.nih.gov/pmc/articles/PMC3075970 //www.ncbi.nlm.nih.gov/pmc/articles/PMC3399636