1-Oxa-7-azaspiro(4.4)non-2-ene-4,6-dione, 8-benzoyl-2-(3,4-dibromo-1,2-dihydroxyhexyl)-9-hydroxy-8-methoxy-3-methyl-, (5S-(2(1R*,2S*,3R*,4R*),5alpha,8beta,9beta))- 12.13-Dibromopseurotin 58546-67-1