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"1) With regard to these compounds, the kinds and the nature of the substituents at the R1, R2 and R3 positions are the main parameters¡­
Please, pay attention. Substituents R were always indicated as superscript numbers."

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"Schemes - I suggest put all number of R groups in superscript form. The number in subscritp meaning that it is a molecule with 1 or 2 or 3 R groups"
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