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sp. WK-3419 as a potent inhibitor against gp 120-CD4 binding.1 The relative and absolute structures of the compound were estimated by an NMR experiment, chemical degradation and a molecular dynamics calculation.2,3 During the course of our total synthesis of chloropeptin, we succeeded to synthesize the chloropeptin left-hand segment.4 The title compound is one of the derivatives of those cyclic left-hand segments. Single crystals of the title compound were obtained from a methanolic solution. Intensity data were collected on a Rigaku AFC5R diffractometer using Cu Kα radiation monochromated with graphite at 23 ̊C. The crystal data are summarized in Table 1. The structure was solved by a direct method (SIR92), expanded by DIRDIF92 and refined by a full-matrix least-squares method with anisotropic thermal parameters for the non-hydrogen atoms. All of the hydrogen atoms indicated in the ORTEP drawing in Fig. 2 were fixed at geometrically reasonable positions and included in an R-factor caluculation. 369 ANALYTICAL SCIENCES MARCH 2002, VOL. 18 2002 © The Japan Society for Analytical Chemistry

analytical sciences

Crystal Structure of Methyl (8R,11R,14S)-8-[N-[(tert-Butoxy)carbonyl]amino]-11-(3,5-dichloro-4-hydroxyphenyl)-18,19-dibromo-5-iodo-4-hydroxy-13-methyl-9,12-dioxo-10,13-diaza-2-oxatricyclo[14.2.2.13,7]heneicosa-3,5,7(21), 16,18,19-hexaene-14-carboxylate