The chemical Rhodamine B has a designated molecular formula of C28H31ClN2O3 and a molecular weight of 479.017 g/mol. Synonyms may include: C.I. 45170, D & C Red No.19, D and C Red No. 19, C.I. Basic Violet 10, C.I. Food Red 15, C.I. No. 45170, D&C Red 19, 11411 Red, D&C red no.19, Acid Brilliant Pink B, ADC Rhodamine B, Aizen Rhodamine BH (ChemID).