Neurosporaxanthin methyl ester

Apocarotenoids. The natural occurrence of neurosporaxanthin methyl ester [methyl 4 -apo-/3-caroten-4 -oate (33)] in the fungus Verticillium agaricinum has been reported. ... 

The methyl ester of neurosporaxanthin has been isolated from Nectria cin-naborina. ... 

As described for neurosporaxanthin (4) [75], exhibit carotenoid carboxylic acids acidic properties, and may therefore be converted to the methyl esters with diazomethane, Fig. 14. The polar carboxylate anion is obtained upon base treatment. Thus neurosporaxanthin (4) becomes completely hypophasic when distributed between petroleum ether and 1 % NaOH in methanol-water (9 1) [75]. 

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