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. 2014 Mar 3;9(3):e89924. doi: 10.1371/journal.pone.0089924

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© 2014 Ihssen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Molecular masses in g mol⁻¹ are given in brackets. (1) Vanillin [152.15], (2) 5-iodovanillin [278.05], (3) divanillin [302.28], (4) o-vanillin (152.15), (5) ethyl vanillin [166.18], (6) acetovanillone [166.18], (7) methyl vanillate [182.17], (8) vanillic acid [168.15], (9) vanillyl alcohol [154.16].