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- [44] STUDIES IN PENICILLIN CHEMISTRY - ISOLATION AND CHARACTERIZATION OF METHYL [2S, 5R, 6R] 3, 3-DIMETHYL-6-HYDROXY-METHYL-8-OXO-4-THIA-1, 7-DIAZABICYCLO [3,3,0]-OCTANE (A) AND [1S, 4R, 5S] 4-HYDROXYMETHYL-7, 7-DIMETHYL-6-THIA-3, 8-DIAZABICYCLO [3,2,1] OCTANE-2-ONE (B) TETRAHEDRON, 1983, 39 (15) : 2465 - 2468