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Abstract. Ochrobirine methanolate, C21H2307 N.CH3OH, M.W. 401.4, orthorhombic, P212121, a=13.528 (5), b=17.455 (7), c=7.909 (3) A, V= 1867"6 •3; dm= 1"42, dc= 1"427 g cm -3 for Z=4.The final R is 0.069 for the 1944 reflections used in the analysis. Ochrobirine is a spirobenzylisoquinoline alkaloid and the two halves of the molecule are almost normal to each other. The molecular dimensions are normal. The ochrobirine and methanol molecules are hydrogen-bonded to each other in the solid state in a helical fashion around the twofold screw axis.