References
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- Satisfactory elemental analyses or high resolution mass spectra were obitained for now compounds.
- Kurokawa , S. , Elix , J. A. , Watson , P. L. and Sargent , M. V. 1971 . J. Jap. Bot. , 46 : 33 Compounds (2) was obtained from notatic acid
- Compound (5) was obtained by degradation and methylation of physodic acid.
- Compound (6) was obtained from norstitic acid.
- Asshina , Y. and Shibata , S. 1954 . Chemistry of Lichen Substances , Tokyo : Japanese Society for the Promotion of Science .