Assertion: carbon's compound | /r/HasProperty | obtained in trace amounts
Facets:
value: so far
type: OTHER
Source sentences:
text: The compounds cyclohexanehexone or triquinoyl (C 6 O 6 ) and cyclopentanepentone or leuconic acid (C 5 O 5 ), which so far have been obtained only in trace amounts, can be regarded as polymers of carbon monoxide.