C.I. 29150; C.I. Direct Orange 26; C.I. Direct Orange 26 (VAN); C.I. Direct Orange 26 disodium salt; C.I. Direct Orange 26, disodium salt (8CI); DIRECT ORANG 26; disodium (3E)-4-oxo-7-({[(6E)-5-oxo-6-(2-phenylhydrazinylidene)-7-sulfonato-5,6-dihydronaphthalen-2-yl]carbamoyl}amino)-3-(2-phenylhydrazinylidene)-3,4-dihydronaphthalene-2-sulfonate