360ChemInform Abstract The structure of the title compound, the major component of the calichemicin complex (isolated from Micromonospora echinospora ssp. calichensis and known as LL-E33288 antibiotics) is investigated in part by chemical (derivatization, degradations etc.) and physical methods. It can be shown that the title compound consists of four glycosidic units, a hexasubstituted benzene moiety and an undefined C18H16NO4S3 unit. The exact configuration of the ethylamino sugar is unknown. In the following paper the structure of the undefined aglycone is reported.

361ChemInform Abstract Further chemical and physical investigations on the structure of the title compound, in addition to the results of the preceding paper, establish its complete structure as (I).

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