Aniline, also known as aniline oil and amino benzene, molecular formula: C6H7N, molecular weight: 93.128, CAS No.: 62-53-3. Aniline is one of the most important aromatic amines. It smells of rotten fish. The burning flame will produce smoke. Aniline is one of the most important amines. Mainly used in the manufacture of dyes, drugs, resins, can also be used as rubber vulcanization accelerator. It can also be used as a black dye. Its derivative methyl orange can be used as an indicator for acid-base titration.