Niels+Bohr: From U.S. 4,772,726: 42g melatonin taken up in 300g isobutanol. Add 30g NaOH and 3g sodium dithionite. Reflux 2h @ 105 deg. under N2. Cool mixt. ext with 500g water. Aqueous phase conatins sodium acetate and excess NaOH-seperate. Acidify isobutanol phase to pH 2 with 32% HCl. Concentrate solution to induce crystallization of 36g crude mexamine. Recrystallize from 96% EtOH to obtain 30g white crystalls of mexamine of 98.5% purity.
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Thii is another post in the Hive. Anyway , mexamine or 5 MeOT is not a controlled chemical and you should not have problems to get it at a reasonable price.