Refers to a molecule that has a symmetry axis that passes through two identical groups.
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C20H18O3
N,N'-bis[(S)-N-benzyloxycarbonylprolyl]-1,2-ethylenediamine
menthyl 2-phenylcyclopropanecarboxylate
1-Bromo-4-tert-butyl-2-nitrobenzene
(2R,3R,4R,5R)-3,4-Dihydroxy-2,5-bis-(2-trimethylsilanylethynyl-benzyloxy)-hexanedioic acid bis-[((1S,2R)-2-hydroxy-indan-1-yl)-amide]