Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → (9S)-1-Acetylamino-9-ethyl-2,3-dihydro-9-hydroxy-1H, 12H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinoline-10,13-(9H,15H)-dione

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[CH2:1]([C@:3]1([OH:19])[C:15]2[CH:14]=[C:13]3[N:9]([CH2:10][CH2:11][C:12]3=O)[C:8](=[O:17])[C:7]=2[CH2:6][O:5][C:4]1=[O:18])[CH3:2].[C:20]([NH:23][CH:24]1[CH2:33][CH2:32][C:31]2[C:26](=[C:27]([NH2:34])[CH:28]=[CH:29][CH:30]=2)[C:25]1=O)(=[O:22])[CH3:21].C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1>C1(C)C=CC=CC=1>[C:20]([NH:23][CH:24]1[C:25]2=[C:11]3[CH2:10][N:9]4[C:13](=[CH:14][C:15]5[C@:3]([CH2:1][CH3:2])([OH:19])[C:4](=[O:18])[O:5][CH2:6][C:7]=5[C:8]4=[O:17])[C:12]3=[N:34][C:27]3[CH:28]=[CH:29][CH:30]=[C:31]([C:26]=32)[CH2:32][CH2:33]1)(=[O:22])[CH3:21]