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(S)-(+)-1,2-diacetyl-1',2',3',8',9',10',11'.23',24',25',26',35'a-dodecahydro-14',20',38',41'-tetramethylspirotrietheno<28,32:31,35>dimetheno<17H><1,6,16,21>tetraoxacyclotritriacontino<25,24-c>pyridine>
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(R)-(-)-1,2-diacetyl-1',2',3',8',9',10',11'.23',24',25',26',35'a-dodecahydro-14',20',38',41'-tetramethylspirotrietheno<28,32:31,35>dimetheno<17H><1,6,16,21>tetraoxacyclotritriacontino<25,24-c>pyridine>
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