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1,2,3,4,6,7,12,12b-octahydro-2-(1,3-dithiolan-2-yl)-indolo<2,3-a>-(6S,12bR)-6-carboxy-quinolizine
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1,2,3,4,6,7,12,12b-octahydro-2-(1,3-dithiolan-2-yl)-indolo<2,3-a>-(6S,12bR)-6-cyano-quinolizine
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1,2,3,4,6,7,12,12b-octahydro-2-(1,3-dithiolan-2-yl)-indolo<2,3-a>-(6S,12bR)-6-carboxymethylquinolizine