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Respective 1H-NMR spectra of lignin oleate extracted from the [C4C1mim][OTf]/[C4C1mim][PF6] binary system with the immobilized lipase B from Candida antarctica (a); control Kraft lignin extracted from the [C4C1mim][OTf]/[C4C1mim][PF6] binary system without enzyme (b) and ethyl oleate (c).
