3-(tert-Butyl-diphenyl-silanyloxymethyl)-1,10-dimethoxy-9-[1-methoxy-meth-(E)-ylidene]-6,7,8,9-tetrahydro-benzo[g]isoquinoline

3-({[(1,1-dimethylethyl)diphenylsilyl]oxy}methyl)-1,3,6',7',8',9'-hexahydro-1',4,5,6,8,9,10'-heptamethoxy-3-(phenylmethylene)spiro[2H-benz[f]indene-2,9'-benz[g]isoquinolin]-1-ol