3-(((tert-butyldiphenylsilyl)oxy)methyl)-1'-hydroxy-1'-(hydroxy(phenyl)methyl)-1,4',5',7',8',9',10-heptamethoxy-7,8-dihydro-6H-spiro[benzo[g]isoquinoline-9,2'-cyclopenta[b]naphthalen]-3'(1'H)-one