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The title compound, C(25)H(34)N(2)O(6), was synthesized from 9α-hy-droxy-parthenolide (9α-hy-droxy-4,8-dimethyl-12-methyl-ene-3,14-dioxatricyclo-[9.3.0.0(2,4)]tetra-dec-7-en-13-one), which was isolated from the chloro-form extract of the aerial parts of Anvillea radiata. The ten-membered ring adopts an approximate chair-chair conformation, while the piperazine ring displays a near regular chair conformation and the five-membered ring an envelope conformation with the C atom closest to the hy-droxy group forming the flap. The mol-ecular conformation is stabilized by an O-H⋯N hydrogen bond, which generates an S(7) loop, and the crystal structure features weak C-H⋯O inter-actions.

acta crystallographica. section e

10α-Hydroxy-13-{[4-(2-hydroxyphenyl)piperazin-1-yl]methyl}-4,9-dimethyl-3,8,15-trioxatetracyclo[10.3.0.0<sup>2,4</sup>.0<sup>7,9</sup>]pentadecan-14-one

10α-Hydroxy-13-{[4-(2-hydroxyphenyl)piperazin-1-yl]methyl}-4,9-dimethyl-3,8,15-trioxatetracyclo[10.3.0.02,4.07,9]pentadecan-14-one

10α-Hydroxy-13-{[4-(2-hydroxyphenyl)piperazin-1-yl]methyl}-4,9-dimethyl-3,8,15-trioxatetracyclo[10.3.0.0^2,4.0^7,9]pentadecan-14-one