The chemical Pyronine B has a designated molecular formula of C21H27ClN2O and a molecular weight of 358.910 g/mol. Synonyms may include: C.I. 45010, E tetraethylpyronin, AI3-52461, Ammonium, (6-diethylamino-3H-xanthen-3-ylidene)diethyl-, chloride, Ammonium, diethyl(6-(diethylamino)-3H-xanthen-3-ylidene)-, chloride, (6-(Diethylamino)-3H-xanthen-3-ylidine)diethylammonium chloride (ChemID).