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Methanesulfonic acid (3aS,5R,6aS,7aR,8R,9R,11aR,11bS,11cS)-3-(tert-butyl-dimethyl-silanyloxy)-5-ethoxy-9-methoxy-8,11a-dimethyl-2-phenylselanyl-1,4,5,6a,7,7a,8,9,10,11,11a,11b-dodecahydro-3aH-6-oxa-benzo[de]anthracen-11c-ylmethyl ester