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- [3] TRANSFORMED STEROIDS .31. SYNTHESIS OF MODEL 20ALPHA, 21BETA AND 20BETA, 21-DIACETATES OF DELTA4-ISOPREGNENTRIOL-17BETA,2OXI, 21 ONS-3 FOR ESTABLISHING CONFIGURATION OF EPIMERIC ON C-20 DELTA4-ISOPREGNENDIOL 17BETA 20XI-ON-3-OIC-21 ACIDS IZVESTIYA AKADEMII NAUK SSSR-SERIYA KHIMICHESKAYA, 1971, (01): : 136 - &