单选题 甲氧苄氨嘧啶的化学名为 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