Assertion: opium's codeine | /r/HasProperty | sixth potent
Facets:
value: as morphine
type: OTHER
Source sentences:
text: The other alkaloids naturally present in opium are much weaker; codeine, for example, is only one-sixth as potent as morphine and is used mainly for cough relief.
text: Codeine is considerably less potent (one-sixth) and is obtained from morphine.