Erythrin /(?)/

E·ryth·rin

Erythrin

n.
  1. A colorless crystalline substance, C20H22O10, extracted from certain lichens, as the various species of Rocella. It is a derivative of orsellinic acid. So called because of certain red compounds derived from it. Called also erythric acid. (Chem.)
  2. See Erythrite, 2. (Min.)