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(4aR,4bS,8S,11aS,13aR)-8-methyl-3,4,4a,4b,5,8,9,10,11,11a,13,13a-dodecahydrospiro[benzo[f]pyrido[2,1-a]isoquinoline-2,2'-[1,3]dithian]-6(1H)-one
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(4aR,4bS,8S,11aS,13aR)-8-methyl-3,4,4a,4b,5,8,9,10,11,11a,13,13a-dodecahydro-2H-benzo[f]pyrido[2,1-a]isoquinoline-2,6(1H)-dione
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(2R,4aR,4bS,8S,11aS,13aR)-2-((tert-butyldimethylsilyl)oxy)-8-methyl-1,2,3,4,4a,4b,5,8,9,10,11,11a,13,13a-tetradecahydro-6H-benzo[f]pyrido[2,1-a]isoquinolin-6-one
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(4aR,4bR,5R,8S,11aS,13aR)-8-methyl-5-(2-methylallyl)-3,4,4a,4b,5,8,9,10,11,11a,13,13a-dodecahydro-2H-benzo[f]pyrido[2,1-a]isoquinoline-2,6(1H)-dione
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(4aR,4bS,8S,11aS,13aR)-8-methyl-6-oxo-1,3,4,4a,4b,5,6,8,9,10,11,11a,13,13a-tetradecahydrospiro[benzo[f]pyrido[2,1-a]isoquinoline-2,2'-[1,3]dithian]-12-yl trifluoromethanesulfonate