Assertion: pyridine | /r/DefinedAs | the chemical abstracts service
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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).