The ability to selectively form a specific stereochemical arrangement of atoms during a chemical reaction.
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(R)-2-[(2S,3S)-2-Methoxy-4-(4-methoxy-benzyloxy)-3-methyl-butyl]-oxirane
(1R*,2R*,3R*)-1,2-diphenyl-1,3-dimethoxybutane
(2E,4S)-5-(benzyloxy)-4-methyl-2-penten-1-ol
