1H-Indole-7-carboxylic acid, 3-(3-oxo-1H,3H-naphtho(1,8-cd)pyran-1-yl)- 3-(3-Oxo-1H,3H-naphtho(1,8-cd)pyran-1-yl)-1H-indole-7-carboxylic acid 3-(7-Carboxyindolyl)naphthalide-1,8 58521-43-0 EINECS 261-305-4