1H-Naphtho(2,3-d)triazole-4,9-dione, 6,7-dimethyl- 4,9-Dihydro-6,7-dimethyl-4,9-dioxo-1H-naphtho(2,3-d)triazole 6,7-Dimethyl-1H-naphtho(2,3-d)triazole-4,9-dione 72364-91-1 Brl 22321