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In the title compound, C(23)H(30)N(2)O(4)·C(2)H(6)O, the indole derivative has four fused rings, forming an indolo[2-3a]quinolizine system, in which one six-membered ring is directly connected to the indole unit and has a distorted chair conformation. The fourth ring is also a six-membered ring, depicting a regular chair conformation. In the crystal, the mol-ecules are linked by N-H⋯O and O-H⋯N inter-actions, forming a C(7) chain.

acta crystallographica. section e

(E)-Methyl 2-[(2S,3S,12bR)-3-ethyl-8-methoxy-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizin-2-yl]-3-methoxyacrylate ethanol solvate