This refers to different isomers (i.e. molecules with the same chemical formula but different structures) that differ in the position of a particular functional group or substituent. In this case, the article discusses two regioisomers of a PBI compound that differ in the position of a side chain.
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1,7-bis(4-nitrophenyl)-N,N'-dioctyl-3:4,9:10-perylenetetracarboxydiimide
DL-Myo-inositol 1,2,4,5-tetrakisphosphate
4-Chloro-1-butyne
Acetic acid (2S,3R,4S,5R,6R)-4,5-diacetoxy-6-acetoxymethyl-2-(5-bromo-2-methoxy-phenoxy)-tetrahydro-pyran-3-yl ester
[1-(4-bromophenyl)-1H-tetrazol-5-yl]-(4-methoxy-phenyl)-amine
4-[4-(4-{4-[(2R,5R)-5-(2,4-Difluoro-phenyl)-5-[1,2,4]triazol-1-ylmethyl-tetrahydro-furan-2-ylmethoxy]-phenyl}-piperazin-1-yl)-phenyl]-2-(2-methoxy-ethoxymethyl)-2,4-dihydro-[1,2,4]triazol-3-one
4-[4-(4-{4-[(2R,5R)-5-(2,4-Difluoro-phenyl)-5-[1,2,4]triazol-1-ylmethyl-tetrahydro-furan-2-ylmethoxy]-phenyl}-piperazin-1-yl)-phenyl]-2-(2-methoxy-ethoxymethyl)-2,4-dihydro-[1,2,4]triazol-3-one
2-(trimethylsilyl)ethyl 2-O-acetyl-3,4,6-tri-O-benzyl-β-D-galactopyranosyl-(1->3)-4,6-O-benzylidene-2-deoxy-2-(N-phthalimidyl)-β-D-glucopyranoside
1-Hepten-3-ol, 1-phenyl-, (1E)-
2-(1-p-tolylbut-3-enyl)malononitrile
