Abstract
The constitution of erythrin has been definitely established. The new important observations now made are as follows: (1) it is not a carboxylic acid; (2) it is optically active; (3) picroerythrin is identical with montagnetol; (4) trimethyl erythrin a compound in which all the phenolic hydroxyl groups are methylated is obtained by the action of diazomethane; (5) on hydrolysis with alcoholic potash the methyl ether yields the ester of dimethyl orsellinic acid and the ester of isoeverninic acid. Consequently, it is concluded that erythrin is the erythrityl ester of lecanoric acid. This is in agreement with the occurrence of lecanoric acid and montagnetol along with erythrin in the lichens.
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