\begin{tikzpicture}[node Distance=2cm]
\node (molecula) {\chemfig{[:-30]*6(-=-(-=[::-60]O)-(-::-60-[::60]*6(-=-=-=))=-(-[::-60]*6(-=(-[::-60]OH)-(-[::-60]N)=(-[::-60]*6(-=-=-=))-=))=)}};
\node[below of=molecula] (cloroni…...1 \begin{tikzpicture}[node distance=2cm] \node (molecula) {\c...of=cloronitroanilina, node distance=4cm] (aminofenol) {\chemf...