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US 4,789,731 AGranted
Semi-synthetic peptide antibiotics
AssigneeBristol-Myers Company
InventorsMasahisa Oka, Keiichi Numata, Masataka Konishi
Life of this patent
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Abstract
Semi-synthetic derivatives of the BU-2867T antibiotics are disclosed. These derivatives are active against experimental mammalian tumors, and may be prepared from enzymatic degradation product(s) of BU-2867T A.
Claims4
A compound of the formula ##STR10## wherein R' is selected from the group consisting of ethyl, ##STR11##
Dependencies are inferred from the claim text.