Synthesis of 14 C‐ and 3 H‐labelled 1,6–dimethyl‐3‐carbethoxy‐4‐oxo‐6,7,8,9‐tetrahydrohomo‐pyrimidazole salts

For pharmacological investigations tetrahydrohomopyrimidazole salts were synthetized which were labelled by 14 C and 3 H isotopes in definite positions. The 1‐methyl‐ 14 C, carbonyl‐ 14 C, 3‐carbethoxyethyl‐ 14 C, 1‐methyl‐ 3 H 6,7,8,9‐ 3 H and 3‐carbethoxyethyl‐ 3 H‐homopyrimidazole isotope isomers were prepared.