FIELD: biochemical and medico- biological research. SUBSTANCE: method comprises reacting original compound of general formula I: 
wherein 
and 
with tritium water by introducing into reactor original compound PdO or mixture of PdO with 5% PdO/Al2O3 by vacuum treatment of reactor and filling it with gaseous tritium and heating it at local cooling by freezing its upper portion, vacuum treating reactor once again, heating to 65-85 C, subsequently introducing dioxane or mixture of triethyl amine thereinto. Reaction of original compound with the resulting tritium water is carried out during heating operation. EFFECT: one of tritium highly marked organic compounds containing C=С bonds is obtained by introducing mark directly into target analogue without changing its structure. 3 cl
