This refers to a molecule in which atoms or groups are attached to carbon atoms at the 3rd and 5th positions of a particular ring or structure.
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2-(1-hydroxy-3-phenylprop-2-yn-1-yl)cyclohex-2-enone
3-(3-(3,4-dimethoxyphenyl)-1H-pyrrolo[2,3-b]pyridin-5-yl)-benzonitrile
3-Benzyl-5-diethoxymethyl-3,6-dihydro-[1,2,3]triazolo[4,5-d]pyrimidin-7-one
