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- [2] Synthesis of Tetracyclic Heterocompounds as Selective Estrogen Receptor Modulators. Part 3. Development of an Acid-Catalyzed Racemization Process for (S)-2,8-(Dimethoxy)-5-{4-[2-(1-piperidinyl)ethoxy]-phenyl}-11,12-dihydro-5H-6,13-dioxabenzo[3,4]cyclohepta[1,2-a]naphthalene ORGANIC PROCESS RESEARCH & DEVELOPMENT, 2009, 13 (01) : 102 - 105