This indicates that there is an aryl group attached at position 2 of the pyrimidine ring. An aryl group typically contains an aromatic ring, such as phenyl or naphthyl.
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[2-(2,6-dimethoxy-phenyl)-4-methoxy-6-methyl-pyrimidin-5-yl]-dipropyl-amine
17α-(2-(4-methoxyphenyl)-1-ethynyl)-5α-androstane-3β,17β-diol
