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Experimental ECD spectrum of pyrrospirone J (10, 200–400 nm) in MeOH and the calculated ECD spectra of the model molecules 10a and 10b at the B3LYP/6-311+G(d,p) level (10a: 2R,4S,5R,6R,7R,8S,9S,10R,11R,12R,13R,15R,17R; 10b: 2S,4R,5S,6S,7S,8R,9R,10S,11S,12S,13S,15S,17S).
