9,19-Cyclo-9b-lanostan-3-one, 16b,24-epoxy-25-hydroxy- (8CI);2H,5H-Cyclopropa[1',8'a]naphth[2',1':4,5]indeno[2,1-b]oxepin,9,19-cyclolanostan-3-one deriv.; Argentatin B; Argentatine B
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