J.R. S. answered 03/23/18
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The first step in the synthesis is the reduction of 3-ethoxy-4-hydroxybenzaldehyde (ethyl vanillin) to 3-ethoxy-4-hydroxybenzyl alcohol (ethyl vanillyl alcohol). In the second step, etherification of 3-ethoxy-4-hydroxybenzyl alcohol yields 3-ethoxy-4-hydroxybenzyl methyl ether (Methyl Diantilis). I refer you to https://pubs.acs.org/doi/abs/10.1021/ed083p285