Assertion: ribose's group | /r/HasAspect | same or opposite handedness
Facets:
value: as the original one
type: OTHER
Source sentences:
text: The ring closure step may use a different −OH group than the one recreated by the opening step (thus switching between pyranose and furanose forms), or the new hemiacetal group created on C-1 may have the same or opposite handedness as the original one (thus switching between the α and β forms).