(11R,11aS)-11-Hydroxy-1,5,11,11a-tetrahydro-1-benzothieno[2,3-f]indolizin-3(2H)-one

The absolute configuration of the title compound, C14H13NO2S, was assigned from the synthesis and confirmed by the structure determination. The central six-membered ring of the indolizine system adopts an envelope conformation, the greatest deviation from the mean plane of the ring being 0.459 (2) Å for the N atom. The benzothieno system is planar [mean deviation = 0.009 (2) Å]. In the crystal structure, molecules form chains parallel to the b axis via intermolecular O—H⋯O hydrogen bonds.

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