It’s used for everything to be honest. It gives a simple to underatand shape of the molecule, from which you can deduce and predict reactions and chemical properties.
Thr chemical formula (eg. C13H16N2O2) tells nothing about the shape, and it would take a while to decrypt the IUPAC name into a tangible shape (eg. N-[2-(5-methoxy-1H-indol-3-yl)ethyl]acetamide).
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