A name that expresses the characteristic group as a class term written as a separate
word following the name of a parent structure or a name derived from a parent structure.
In the latter case, when the derived name is that for a substituent group (formerly
called a 'radical
'), the method has been called 'radicofunctional nomenclature
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook