FIELD: chemistry.
SUBSTANCE: invention relates to a method of synthesising ergothioneine or one of its derivatives of formula 
:
from a compound of betaine type of formula 
:
by cleavage reaction in the presence of thiol at a temperature of 60°C and higher. The invention also relates to compounds of formula (II) and to a method of their synthesis.
EFFECT: increase of the synthesis efficiency.
19 cl, 5 ex
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