Referring to a functional group or atom that is outside of the cyclic structure of a molecule.
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methyl 2,5-di-O-benzyl-α-L-xylofuranoside
Aziridine, 1-[(4-methylphenyl)sulfonyl]-2-(2-propenyl)-
Acetamide, N-(4,5-dihydro-5-methylene-2-thiazolyl)-N-phenyl-
(E)-2-(4-chloro-phenylmethylene)-cyclohexanol
