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(1S,2S,3R,4aS,13bR,14aS)-3-(tert-Butyl-dimethyl-silanyloxy)-2,11-dimethoxy-5-oxo-1-trimethylsilanyloxy-1,2,3,4,4a,5,7,8,13,13b,14,14a-dodecahydro-indolo[2',3':3,4]pyrido[1,2-b]isoquinoline-1-carboxylic acid methyl ester