What is a bluish violet, crystalline substance obtained in the purification of crude wood vinegar. It is regarded as a complex quinone derivative of diphenyl; -- called also cedriret called?

coerulignone — A bluish violet, crystalline substance obtained in the purification of crude wood vinegar. It is regarded as a complex quinone derivative of diphenyl; -- called also cedriret. (Webster's 1913.)

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