Isorubijervosine (C33H53O7N), a new glucosidic alkaloid, as well as the known glucosides, pseudojervine and veratrosine, has been isolated from Veratrum eschscholtzii Gray. On acid hydrolysis, isorubijervosine yielded the aglycone isorubijervine, and D-glueose. Isorubijervosine was shown to be 3(β.]-D-glucosyl-Δ5-solanidene-18-ol. © 1953, American Chemical Society. All rights reserved.