Refers to a chemical compound with substituents (atoms or groups of atoms) attached to the first and fourth positions of a specific molecular structure or backbone.
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5-bromo-1-phenethyl-4-phenyl-1H-1,2,3-triazole
methyl 4-(cyano(1H-pyrrol-1-yl)methyl)benzoate
4-[1-(4-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]morpholine
