(9'Z,13'Z,15'E)-4,11'-dihydroxy-2',4,9'-trimethyl-4'H,5H,12'H-spiro[1,2-dithiolane-3,6'-[19]thia[3,20]diazabicyclo[15.2.1]icosa[1(20),9,13,15,17]pentaene]-4',5,12'-trione
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