67123-64-2 Aristolochic acids CCRIS 52 Phenanthro(3,4-d)-1,3-dioxole-5-carboxylic acid, 6-nitro-, bis(8-methoxy-6-nitrophenanthro(3,4-d)-1,3-dioxole-5-carboxylate) Phenanthro(3,4-d)-1,3-dioxole-5-carboxylic acid, 8-methoxy-6-nitro-, 6-nitrophenanthro(3,4-d)-1,3-dioxole-5-carboxylate (2:1)