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- [21] OLIVANIC ACID ANALOGS .10. X-RAY CRYSTALLOGRAPHIC STUDY OF THE STEREOCHEMISTRY OF SOME 7-HETEROATOM-SUBSTITUTED 7-ACETYL-8-OXO-3-OXA-1-AZABICYCLO[4.2.0]OCTANE-2-SPIROCYCLOHEXANES - FUNCTIONAL-GROUP CONTROL OF THE STEREOSELECTIVITY OF THEIR REDUCTION PRODUCTS USING BOROHYDRIDE REAGENTS JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1992, (11): : 1305 - 1312