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(a) MS spectrum of feature M287T644, isolated from the extract of Pseudoplexaura flagellosa (b) MS/MS spectrum of compound m/z: 287.2374 [M + H]+. (c). 1H NMR spectrum of 13-keto-1,11-dolabell-3(E),7(E),12(18)-triene and chemical structure of C20H30O.
