title: (8aR,9R)-9-Hy-droxy-7,8,8a,9-tetra-hydro-furo[3,2-f]indolizin-6(4H)-one.
abstract: The title compound, C(10)H(11)NO(3), crystallizes with four independent mol-ecules in the asymmetric unit. Their geometries are very similar and corresponding bond distances are almost identical. The central six-membered ring of the indolizine moiety adopts a envelope conformation [the displacement of the flap atom (the C atom opposite the N atom) being 0.539 (2), 0.548 (3), 0.509 (3) and 0.544 (3) Å in the four molecules], while the conformation of the oxopyrrolidine ring is close to that of a flat envelope. The displacements of the non-fused C atom opposite the C=O group of the pyrrolidine ring of the four mol-ecules are 0.366 (3), 0.335 (3), 0.173 (3) and -0.310 (3) Å. In the crystal, O-H⋯O hydrogen bonds link the mol-ecules into chains, which run parallel to the c axis. The absolute configuration was assigned from the synthesis.
authors.affiliation: Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava,  Slovak Republic  81237.
authors.forename: Viktor
authors.initials: V
authors.lastname: Vrábel
authors.forename: Lubomír
authors.initials: L
authors.lastname: Svorc
authors.forename: Peter
authors.initials: P
authors.lastname: Safář
authors.forename: Július
authors.initials: J
authors.lastname: Sivý
authors.forename: Zúžiová
authors.initials: Z
authors.lastname: Jozefína