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Pablo H. Di Chenna, Adriana S. Veleiro, Juan M. Sonego, Nora R. Ceballos, M. Teresa Garland, Ricardo F. Baggio, Gerardo Burton. "Synthesis of 6,19-cyclopregnanes. Constrained analogues of steroid hormones." Organic and biomolecular chemistry 5.15 (2007) 2453