3,6,12,15-Tetraoxa-9-thia-21-azabicyclo(15.3.1)henicosa-1(21),17,19-triene-2,16-dione;3,6,12,15-Tetraoxa-9-thia-21-azabicyclo[15.3.1]henicosa-1(21),17,19-triene-2,16-dione
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