@M04021@ having a carbon–carbon double bond anywhere in the @B00574@ chain. @G02644-1@ (term not recommended) designates the enoses that are generated by formal @E02038@ of the hemiacetal hydroxy group and an adjacent hydrogen atom. Thus @G02644-2@ are cyclic @E02124@. Unsaturated hexoses, for example, are called hexenoses, e.g. the hex-1-enopyranose derived from d-glucopyranose):
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1334 [Terms] [Paper]