9. 甲氧苄啶的化学名为（ ）
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
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