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2. S. Ishii, Appl. Entomol. Zool.7, 226 (1972).
3. J. B. Stothers,Carbon-13 NMR-Spectroscopy (Academic Press, New York, 1972), andG. C. Levy andG. L. Nelson,Carbon-13 Nuclear Magnetic Resonance for Organic Chemists (Wiley-Interscience, New York 1972).
4. Mass spectrum was measured with a Hitachi RMS-4 mass spectrometer attached with a Hitachi K-53 gas chromatograph (5% OV-17).
5. In spite of the presence of 2 possible asymmetric carbons, no optical rotation was observed inn-hexane solution (c=1.85) in the range 240–600 nm.