FIELD: chemistry.
SUBSTANCE: invention relates to thietane-containing 1-butyl-3-methylxanthines of general formula (Ia) and (Ib), where R-i-Bu, n=1, m=2, Bm+= 
(Ia); R=Bu, n=0, m=1, Bm+=H3N+C(CH2OH)3 (Ib).
EFFECT: obtaining novel compounds of general formula (Ia) and (Ib), having antioxidant activity, which can be used in medicine.
4 cl, 1 tbl, 3 ex
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