title: Structure of lansimide 2, a product from Clausena lansium.
abstract: The natural product lansimide 2 is a 1:1 mixture of two different cyclic amides, C18H17NO2.C18H19NO3. The mixture crystallizes as a molecular pair in the centrosymmetric space group P21/n. M(r) = 576.69, monoclinic, a = 20.151 (2), b = 6.2984 (4), c = 24.051 (2) A, beta = 104.339 (8) degrees, V = 2957.4 A3, Z = 4, Dx = 1.30 g cm-3, Cu K alpha, lambda = 1.54178 A, mu = 6.1 cm-1, F(000) = 1224, T = 163 (1) K, R = 0.033, wR = 0.034 for 5002 observed reflections.
authors.affiliation: Department of Chemistry and Biochemistry, University of Oklahoma, Norman 73019.
authors.forename: X
authors.initials: X
authors.lastname: Ji
authors.forename: D
authors.initials: D
authors.lastname: van der Helm
authors.forename: V
authors.initials: V
authors.lastname: Lakshmi
authors.forename: S K
authors.initials: SK
authors.lastname: Agarwal
authors.forename: R S
authors.initials: RS
authors.lastname: Kapil
mesh_terms: D007769:Lactams / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D011760:Pyrrolidinones / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D007769:Lactams; D010936:Plant Extracts; D011760:Pyrrolidinones; C077006:lansimide 2