(5S,11aR)-3,11a-di((S)-sec-butyl)-2-hydroxy-5-methoxy-1-oxo-9-(2,3,5,6-tetraacetoxy-4'-(benzyloxy)-[1,1'-biphenyl]-4-yl)-1,2,5,11a-tetrahydrobenzo[e]pyrazino[1,2-b][1,4,2]dioxazin-5-ium-4-olate