Phenazine

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What Wikipedia says

Phenazine is an organic compound with the formula (C6H4)2N2. It is a dibenzo annulated pyrazine, and the parent substance of many dyestuffs, such as the toluylene red, indulines, and safranines (and the closely related eurhodines). Phenazine crystallizes in yellow needles, which are only sparingly soluble in alcohol.

Excerpt from the Wikipedia article “Phenazine”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Emeldir (talk), Public domain, via Wikimedia Commons.