Refers to two identical groups attached to the same atom in a molecule
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(1R*,2R*)-(Z)-4-chloro-2-methyl-1-phenyl-3-buten-1-ol
(2R,3S,5R,6S)-5-(tert-Butyl-dimethyl-silanyloxy)-4-[2-hydroxy-eth-(E)-ylidene]-6-methoxy-2-trityloxymethyl-tetrahydro-pyran-3-ol
