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The title compound (systematic name: 12-{[2-(4-hydroxyphenyl)ethyl]aminomethyl}-4,8-dimethyl-3,14-dioxatricyclo[9.3.0.0 2,4 ]tetradec-7-en-13-one monohydrate), C 23 H 31 NO 4 ·H 2 O, was obtained by the reaction of tyramine with parthenolide. The configuration of the new chiral center in the title compound is  R , establishing the stereospecificity of the amination reaction. The water molecule is disordered over three positions; the site occupancy factors are 0.45, 0.40 and 0.15.

(11R)-13-[2-(4-Hydroxyphenyl)ethylamino]-4,5-epoxy-11,13-dihydrocostunolide monohydrate