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Five minor prodiginine pigments were isolated from Actinomadura madurae and A. pelletieri fermentations. Two of the pigments were shown to be methylcyclooctylprodiginine ( 7 ) and ethylcyclononylprodiginine ( 8 ). For the others, structures containing oxygen functions in the aliphatic chains ( 11 , 12 and 13 ) were suggested.
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Nancy N. Gerber (1973) studied this question.
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