having the same molecular formula but different arrangement of atoms
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(3aR)-4α-Acetoxy-3aβ,4,5,5a,6,7,8,9bα-octahydro-6α-hydroxy-5aα,9-dimethyl-3-methylenenaphtho[1,2-b]furan-2(3H)-one
3-amino-4-imino-5-phenyl-7-(4-fluorophenyl)-7H-pyrrolo[2,3-d]pyrimidine
C50H67NO8S
1-Propen-1-one, 2-phenyl-
3-quinuclidinyl tropate
3-O-benzoyloxy-5-deoxy-1,2-O-isopropylidene-α-D-ribohexofuranose
methyl 5-O-benzoyl-3-deoxy-D-erythro-pentofuranose
3-<(p-bromophenacyl)thio>isoquinoline
N4-(4-methylphenyl)-3,4-Pyridinediamine