7-Nitronaphth(1,2-d)(1,2,3)oxadiazole-5-sulfonic acid 7-Nitronaphth(1,2-d)(1,2,3)oxadiazole-5-sulphonic acid 84-91-3 EINECS 201-573-1 Naphth(1,2-d)(1,2,3)oxadiazole-5-sulfonic acid, 7-nitro-