Found 1 items, similar to c7h7no3.
English → English (gcide) Definition: C7H7NO3 Orcein \Or"ce*in\, n. (Chem.) A reddish brown amorphous dyestuff, C7H7NO3, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus. [1913 Webster]