Assertion: pyridine | /r/HasProperty | derived through coal tar distillation
Facets:
value: naturally
type: MANNER
Source sentences:
text: Pyridine, alkyl derivs. is a UVCB mixture of polyalkylated pyridines that, as defined by the Chemical Abstracts Service, may either be derived naturally through coal tar distillation or synthetically as the high-boiling distillates approximately above 150°C from the reaction of ammonia with acetaldehyde, formaldehyde or paraformaldehyde (NCI 2010).