(4aR,4bR,5S,8S,11aS,13aR)-8-methyl-5-(2-methylallyl)-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

(4aR,4bR,5R,8S,11aS,13aR)-8-methyl-5-(2-methylallyl)-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