C10H5OHNH2SO3Na
Eikonogen Ei*kon"o*gen, n. [Gr. e'ikw`n, e'iko`nos, image + root of gi`gnesqai to be born.] (Photog. & Chem.) The sodium salt of a sulphonic acid of a naphthol, {C10H5(OH)(NH2)SO3Na} used as a developer. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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