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. 2019 Sep 26;14(9):e0223017. doi: 10.1371/journal.pone.0223017

Fig 4. Preparation of eugenol derivatives 23–49.

Fig 4

iii) sodium ascorbate (40 mol%), CuSO4·5H2O (20 mol%), EtOH/H2O (1:1 v/v).