(5-~3H)UMP, (5-~3H)CMP, (8-~3H)AMP and (8-~3H)GMP is prepared from 5Br-UMP, 5BrCMP, 8BrAMP and 8BrGMP by catalytic halogen--tritium replacement.

• 以5 BrUMP、5 BrCMP、8 BrAMP及8 BrGMP为原料,使用催化氚卤置换法制备了[5-~3H]UMP、[5-~3H]CMP、[8-~3H]AMP及[8-~3H]GMP。