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RNAUnfortunately the position of the cyclopropane ring cannot be determined directly by mass spectrometry (Pohl et al., 1963;Wood and Reiser, 1965;Christie and Holman, 1966).The exact location of this group will be investigated in the near future according to McCloskey and Law (1967).Gas Chromatography. Relative retention times on the his interest and stimulating discussions and to Dr. W. Heerma for recording the mass spectra.

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