\begin{frame}{Основания}
\setatomsep{1.6em}%
\footnotesize \begin{tabular}{c c c c}
\chemfig{*6((-[5,0.5,,,draw=none]\color{blue}2)=N(-[6,0.5,,,draw=none]\color{blue}3)-
(-[6,0.5,,,draw=none]\color{blue}4)*6(
-\chembelow{N}{H}(-[6,1.0,,,draw=none]\color{blue}9)-
(-[7,0.5,,,draw=none]\color{blue}8)=N?(-[1,0.5,,,draw=none]\color{blue}7))
=?(-[2,0.5,,,draw=none]\color{blue}5)-(-[2,0.5,,,draw=none]\color{blue}6)
=N(-[3,0.5,,,draw=none]\color{blue}1)-[,,1])} &
\chemfig{*6((-[:-130]H_2N)=N-*6(-\chembelow{N}{H}-=N?)=?-(=[2]O)-HN-[,,2])}&
\chemfig{*6(=N-*6(-\chembelow{N}{H}-=N?)=?-(-[2]NH_2)=N-[,,1])}&~\\[1.0cm]-HN-[,,2])}&
\chemfig{*6(=N-*6(-\chembelow{N}{H}-=N?)=?-(-[2]NH_2)=N-[,,1])}&~\\[1.0cm]
Пурин&Гуанин&Аденин& \\[.2cm]
\hline\\[.2cm]
\chemfig{*6((-[5,0.5,,,draw=none]\color{blue}2)=N(-[6,0.5,,,draw=none]\color{blue}1)
-(-[7,0.5,,,draw=none]\color{blue}6)
=(-[1,0.5,,,draw=none]\color{blue}5)-(-[2,0.5,,,draw=none]\color{blue}4)=N(
-[3,0.6,,,draw=none]\color{blue}3)-)} &
\chemfig{*6((=[5]O)-\chembelow{N}{H}-=-(-[2]NH_2)=N-)} &
\chemfig{*6((=[5]O)-\chembelow{N}{H}-=-(=[2]O)-HN-[,,2])} &
\chemfig{*6((=[5]O)-\chembelow{N}{H}-=(-[1])-(=[2]O)-HN-[,,2])}
\\[1.0cm]
Пиримидин&Цитозин&Урацил&Тимин\\[.2cm]
\hline
\end{tabular}
\end{center}
\end{frame}
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