Formaldehyde was first reported by the Russian chemist Aleksandr Butlerov (1828-1886), but it was conclusively identified by August Wilhelm von Hofmann.
Molecular Structure of A fridol blue (CAS NO.47897-65-4):
IUPAC Name: tetrasodium (1Z)-5-amino-1-[[4-[4-[(2Z)-2-(5-amino-4-oxo-2,7-disulfonatonaphthalen-1-ylidene)hydrazinyl]-3-chlorophenyl]-2-chlorophenyl]hydrazinylidene]-4-oxonaphthalene-2,7-disulfonate
Empirical Formula: C32H18Cl2N6Na4O14S4
Molecular Weight: 1001.6422
Classification Code: Reproductive Effect
An experimental teratogen. Other experimental reproductive effects. When heated to decomposition it emits very toxic fumes of SOx, NOx, Na2O, and Cl−.
A fridol blue , with CAS number of 47897-65-4, can be called 2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dichloro-4,4'-
biphenylylene)bis(azo))bis(5-amino-4-hydroxy-, tetrasodium salt .