10169-52-5 1H-Indol-3-ol, 2-(9-chloro-3-(sulfooxy)naphtho(1,2-b)thien-2-yl)-, hydrogen sulfate (ester), disodium salt Disodium 2-(9-chloro-3-(sulphonatooxy)naphtho(1,2-b)thien-2-yl)-1H-indol-3-yl sulphate EINECS 233-441-4