1-Oxa-2-azaspiro(4.5)deca-2,6,8-triene-3-carboxamide, 7,9-dibromo-N-(3-(2,6-dibromo-4-(2-(((7,9-dibromo-10-hydroxy-8-methoxy-1-oxa-2-azaspiro(4.5)deca-2,6,8-trien-3-yl)carbonyl)amino)-1-hydroxyethyl)phenoxy)-2-hydroxypropyl)-10-hydroxy-8-methoxy-