2-[7-(1,3-Dihydro-1,3,3-trimethyl-5-sulfo-2H-indol-2-ylidene)-1,3,5-heptatrienyl]-1,3,3-trimethyl-5-sulfo-3H-indolium inner salt sodium salt monohydrate
2-[7-(1,3-Dihydro-1,3,3-trimethyl-5-sulfo-2H-indol-2-ylidene)-1,3,5-heptatrienyl]-1,3,3-trimethyl-5-sulfo-3H-indolium inner salt sodium salt monohydrate