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- [1] TETRACYCLIC TRITERPENES .8. THE SKELETAL REARRANGEMENT OF 3-BETA-ACETOXY-9-ALPHA,11-ALPHA-EPOXY-5-ALPHA-LANOSTAN-7-ONE - 13-METHYL AND 10-METHYL GROUP MIGRATION CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE, 1985, 63 (06): : 1280 - 1286