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- [3] STRUCTURE OF METHYL (4R)-2BETA-BROMO-3-OXO-19-NOR-16ALPHA-(-)-KAURAN-17-OATE,C20H29O3BR ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1976, 32 (JAN15): : 254 - 257
- [4] CRYSTAL AND MOLECULAR-STRUCTURE OF A NEW CYCLOPROPANE TRITERPENE - PASSIFLORIC ACID METHYL-ESTER [METHYL(22R,24S)-22,31-EPOXY-1ALPHA,3BETA,24,31-TETRAHYDROXY-24-METHYL-9,19-CYCLO-9BETA-LANOSTAN-28-OATE] JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2, 1977, (05): : 605 - 608