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- [15] H-1 AND C-13 NMR-SPECTRA OF BIOLOGICALLY-ACTIVE COMPOUNDS .10. HH-COSY (45-DEGREES) AND CH-HET-CORR 2-DIMENSIONAL SPECTRA OF 18-ALPHA-ISOMERS AND 18-BETA-ISOMERS OF GLYCYRRHETIC ACID 3-ACETATE KHIMIYA PRIRODNYKH SOEDINENII, 1991, (03): : 363 - 368