thesis of antitumor antibiotics.3 Acknowledgment. Annulation experiments involving dichlorocyclobutenones were carried out by Katherine S. Takaki. We thank the National Institutes of Health and Eli Lilly and Co. for generous financial support. Supplementary Material Available: Full characterization (250-MHz NMR, 13C NMR, IR, and high-resolution mass spectral data and/or elemental analyses) for all new compounds (7 pages). Ordering information is given on any current masthead page.
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