try the ref

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the first table to ref \ref{first}

Side groups investigated for this molecule series
\label{first} Nubmer Side Groups
1 \(NO_{2}\)
2 \(CN\)
3 \(F\)
4 \(H\)
5 \(t-Butyl\)
6 \(OMe\)
7 \(NMe_{2}\)

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