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Acta Cryst. (2013). E69, o1835-o1836
[ doi:10.1107/S1600536813031735 ]

(S)-(+)-cis-4'-Benzyl­oxypraziquantel

A. Cedillo-Cruz, M. I. Aguilar and H. Jung-Cook

Abstract: The asymmetric unit of the title compound, C26H30N2O3 {systematic name (S)-(+)-2-[cis-4-(benz­yloxy)cyclo­hexa­ne­carb­on­yl]-1,2,3,6,7,11b-hexa­hydro-4H-pyrazino­[2,1-a]isoquin­olin-4-one}, consists of two independent mol­ecules in which the O= Camide group is syn to the N-C(C=Olactam) moiety, making dihedral angles of 2.0 (8) and 3.7 (8)°. The conformation of the 1,4-disubstituted cyclo­hexane ring is cis in each independent mol­ecule, with the carbonyl group occupying an equatorial position and the benz­yloxy group an axial position. In one mol­ecule, two C and one O atom of the benz­yloxy group are disordered over two sets of sites, with a refined occupancy ratio of 0.772 (8):0.228 (8). In the crystal, mol­ecules are linked by C-H...O inter­actions, forming ribbons parallel to the b-axis direction.


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