c7h7no3

1 definition found

c7h7no3 - Collaborative International Dictionary of English v.0.48 :

  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]