disodium 5-[[4'-[(2-amino-8-hydroxy-6-sulphonato-1-naphthyl)azo][1,1'-biphenyl]-4-yl]azo]salicylate Direct red 1 (C.I. 22310) 5-[[4'-[(2-Amino-8-hydroxy-6-sulfo-1-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]-2-hydroxybenzoic acid disodium salt C.I. Direct Red 1, disodium salt CIDIRECTRED1 airedale red fd aizen direct fast red fh amanil fast red fs