The Synthesis of 5,11,17‐Trihalotetracyclo [13.3.1.13,7.19,13]henicosa‐1 (19),3,5,7 (20),9,11,13 (21), 15,17‐nonaene‐19,20,21‐triols and 5,11,17‐trihalo‐19,20,21‐trihydroxytetracyclo [13.3.1.13,7. 19,13]henicosa‐1 (19),3,5,7 (20),9,11,13(21), 15,17‐nonaene‐8,14‐dione [1]. Cyclo‐derivatives of Phloroglucide Analogues

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Abstract
The synthesis of the title compounds (1 and 3) is described. Some of the compounds prepared were found to be active against a number of pathogenic microorganisms in vitro. Structure‐activity relationship is briefly discussed.