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uncountable
(organic chemistry) An odorless, whitish, crystalline powder, C13H13N3, commonly used in the vulcanization of rubbers. quotations examples
Slightly more than this quantity of diphenylguanidine was required, and about ten times as much triethylamine.
1947, United States. National Bureau of Standards, Journal of Research of the National Bureau of Standards, page 245
The ring hydroxylation of diphenylguanidine occurred to give the metabolite (2) while introduction of fluorine substituents blocked this hydroxylation […]
1996, D. R. Hawkins, Biotransformations, page 1