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SYNTHESIS OF 3-SUBSTITUTED CEPHEMS FROM PENICILLINS VIA 4-DITHIO-2-AZETIDINONE INTERMEDIATES.HAMASHIMA Y; KUBOTA T; ISHIKURA K et al.1976; HETEROCYCLES; JAP.; DA. 1976; VOL. 5; NO SPEC.; PP. 419-426; BIBL. 8 REF.Article

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