Syonyms Name: C.I. 22240; C.I. Direct Red 37; C.I. Direct Red 37, disodium salt; C.I. Direct Red 37, disodium salt (8CI); Direct scarlet B; (8Z)-8-({4'-[(E)-(4-ethoxyphenyl)diazenyl]biphenyl-4-yl}hydrazono)-7-oxo-7,8-dihydronaphthalene-1,3-disulfonic acid