6,6'-Oxybis(2-naphthalenesulfonic acid) in Schaeffer's salt.
D000438:Alcohols / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D002845:Chromatography; D004396:Coloring Agents / Q000032:analysis; D004340:Drug Contamination; D004987:Ethers / Q000032:analysis / Q000302:isolation & purification; D005503:Food Additives / Q000032:analysis; D009281:Naphthalenes / Q000032:analysis / Q000302:isolation & purification; D013056:Spectrophotometry, Ultraviolet; D013451:Sulfonic Acids / Q000032:analysis* / Q000302:isolation & purification
D000438:Alcohols; D004396:Coloring Agents; D004987:Ethers; D005503:Food Additives; D009281:Naphthalenes; D013451:Sulfonic Acids