FD & C Red #40 Disodiumsaltof2-hydroxy-1-(2-methoxy-5-methyl-4-sulfonatophenylazo)naphthalene-6-sulfonate. Brilliant Red Developing Base RB FD&C red 40 (C.I. 16035) Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonate Allura Red AC standard FD and C Red No.40 ALLURA RED C.I. 16035 2-naphthalenesulfonic Acid, 6-hydroxy-5-[(6-methoxy- 4-sulfo-m-tolyl)azo]-, Disodium Salt