4-(2-pyridylazo)resorcinol monosodium salt hydrate;4-(2'-pyridylazo)resorcinol monosodium salt monohydrate;4-(2-pyridylazo)resorcinol monosodium salt monohydrate;4-(2'-pyridylazo)resorcinol sodium salt;4-(2-pyridylazo)resorcinol sodium salt, hydrate;par;par water soluble;par monosodium salt hydrate