Eosine Yellowish YS Dipotassium Salt is a chemical compound that is commonly used as a staining agent in laboratory settings. However, there are several synonyms for this compound that can be used interchangeably. Some of the synonyms for Eosine Yellowish YS Dipotassium Salt include Eosin Yellowish YS Dipotassium Salt, Erythrosine Yellowish YS Dipotassium Salt, and C.I. 45400. These terms all refer to the same compound and can be used to describe its properties or uses. Whether researchers are referring to Eosine Yellowish YS Dipotassium Salt or one of its synonyms, they are all referring to the same chemical compound.