`OH ^(- )gtNH_(2)^(-)gt ""^(-)OCH_3gt RNH_2``NH_2^(-) gt OH^(-)gt ""^(-)OCI_(3)gt RNH_2``NH_2^(-)gtCH_3 O^(-)gtOH^(-)RNH_2``CH_3 O^(-) gtNH_(2 )^(-)gtRNH_2`
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