(2'S,5'R,5a'R,8'S,9'S,9a'S)-9'-bromo-5',8'-dimethylhexahydro-6'H-spiro[oxirane-2,12'-[8,5a](epoxymethano)[2,5]methanobenzo[b]oxepin]-3'(2'H)-one

(2'R,3'S,4'S,5'S,5a'R,8'S,9'S,9a'S)-9'-bromo-5',8'-dimethyloctahydro-6'H-spiro[oxirane-2,12'-[8,5a](epoxymethano)[2,5]methanobenzo[b]oxepine]-3',4'-diyl dimethanesulfonate