A polyketide or glycosylated polyketide which has the formula: ##STR1##

wherein R* is methyl or ethyl;

each of R1-R6 is methyl;

X1 is OH or H; and/or

X2 is=O, OH or H;

X3 is OH or H;

X4 is OH or H;

a pi bond is present at positions 10-11, 8-9, 4-5 and/or 2-3; and wherein at least one of the following characteristics is present:

X1 is H;

X2 is OH or H;

X3 is H;

X4 is H; or

a pi bond is present at positions 10-11, 8-9, 4-5 and/or 2-3.

 
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