(5R,6aS,10aR,11S)-2-ethoxy-6a,7,11-trimethyl-13-methylene-5,6,6a,9,10,10a,11,12-octahydro-5,11-methanodibenzo[a,e][8]annulen-4-ol

2-bromo-1-(bromomethyl)-3-(tert-butoxy)-5-ethoxybenzene

(4a'S,5'S,8a'S)-5'-(2-bromo-3-(tert-butoxy)-5-ethoxybenzyl)-5',8a'-dimethylhexahydro-2'H-spiro[[1,3]dioxolane-2,1'-naphthalen]-6'(7'H)-one

(4aS,5S,11S,12aS)-10-(tert-butoxy)-8-ethoxy-5,12a-dimethyl-3,4,4a,5,6,11,12,12a-octahydro-2H-spiro[5,11-methanodibenzo[a,e][8]annulene-1,2'-[1,3]dioxolan]-13-one

(4aR,5S,11S,12aS)-10-(tert-butoxy)-8-ethoxy-5,12a-dimethyl-2,3,4,4a,5,6,12,12a-octahydro-5,11-methanodibenzo[a,e][8]annulene-1,13(11H)-dione