Assertion: phosgene | /r/ObjectUse | used as important precursor
Facets:
value: extensively
type: DEGREE
Source sentences:
text: Phosgene is extremely poisonous by inhalation, highly toxic and hazardous substance, extensively used as an important precursor for manufacture of a wide range of chemicals, as polymers (polyurethanes and polycarbonates) pesticides, pharmaceuticals intermediates.