Synonyms: 2,3-Dihydro-2-(2-hydroxyethyl)-1,3-dioxo-1H-xantheno(2,1,9-def)isoquinoline-5,9-disulphonic acid, compound with 2-aminoethanol (1:2);1H-Xantheno(2,1,9-def)isoquinoline-5,9-disulfonic acid, 2,3-dihydro-2-(2-hydroxyethyl)-1,3-dioxo-, compd. with 2-aminoethanol (1:2)