Assertion: opium's codeine | /r/HasProperty | obtained
Facets:
value: from morphine
type: OTHER
value: from natural sources
type: OTHER
Source sentences:
text: Codeine is the most widely used opium alkaloid and is obtained from natural sources or through the methylation of morphine or synthetic transformation of thebaine.
text: Codeine is considerably less potent (one-sixth) and is obtained from morphine.