10H-Pyrano[3,4-f]indolizine-3,6,10-trione,7-chloro-4-ethyl-1,4,7,8-tetrahydro-4-hydroxy-, (4S)- (9CI);(4S)-7-Chloro-4-ethyl-4-hydroxy-7,8-dihydro-1H-pyrano[3,4-f]indolizine-3,6,10(4H)-trione;
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