A、5-[[3,4,5- trimethoxyphenyl]methyl]-2,6-pyrimidine diamine
B、5-[[3,4,5- trimethoxyphenyl]methyl]-4,6-pyrimidine diamine
C、5-[[3,4,5- trimethoxyphenyl]methyl]-2,4-pyrimidine diamine
D、5-[[3,4,5- trimethoxyphenyl] ethyl]-2,4-pyrimidine diamine
E、5-[[3,4,5- trimethyphenyl]methyl]-2.4-pyrimidine diamine