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- UV and 13C-NMR (carbon bearing the heterocycle) chemical shift data of the major and minor isomers; 1a and 1b through 5a and 5b Compounds UV (EtOH, nm) 13C NMR (ppm, DMSOd6 ) 1a 234, 281 85.9 1b 234, 281 84.3 2a 233, 281 91.4 2b 233, 281 86.6 3a 231, 282, 329 66.8 3b 231, 282, 329 66.1 4a 233, 280 84.3 4b 232, 279 81.7 5a 231, 280 73.6 5b 231, 280 62.1