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Mass spectra of the fatty acids present in the constituent congeners derivatized to fatty acid methyl esters (FAMEs) (A) commercially available sophorolipid 1′,4′′-Sophorolactone 6′,6′′-diacetate (SL-S) (B) sophorolipid produced by R. babjevae YS3 (SL-YS3) as identified by GC–MS analysis.
