Referring to a specific chemical group or structure attached to the main molecular backbone.
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(+/-)-2,3-Epoxy-1-tosyloxypent-4-ene
3-chloro-5-isoxazolecarboxylic acid(SALTDATA: FREE)
Benzoic acid, 2-fluoro-4-hydroxy-, (2S)-2-methylbutyl ester
(2-bromo-6-fluoro-phenyl)-carbamic acid tert-butyl ester