A、5-[[3,4,5-trimethoxyphenyl]methyl]-2,6-pyrimidinediamine

B、5-[[3,4,5-trimethoxyphenyl]methyl]-4,6-pyrimidinediamine

C、5-[[3,4,5-trimethoxyphenyl]methyl]-2,4-pyrimidinediamine

D、5-[[3,4,5-trimethoxyphenyl]ethyl]-2,4-pyrimidinediamine

E、5-[[3,4,5-trimethyphenyl]methyl]-2,4-pyrimidinediamine