2,5-di((S)-sec-butyl)-3,6-dichloropyrazine 1,4-dioxide

2,5-di((S)-sec-butyl)-3,6-bis(2-(trimethylsilyl)ethoxy)pyrazine 1,4-dioxide

2,5-di((S)-sec-butyl)-4-methoxy-3-oxo-6-(2-(trimethylsilyl)ethoxy)-3,4-dihydropyrazine 1-oxide

(5R,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

(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