5H-Pyrrolo[2,1-c][1,4]benzodiazepin-5-one, 7-[[4,6-dideoxy-3-C-methyl-4-(methylamino)-.beta.-D-altropyranosyl]oxy]-10,11-dihydro-9,11-dihydroxy-8-methyl-2-(1-propenyl)-, compd. with sulfur dioxide (1:1) NSC291320 SIBIROMYCIN SO2 ADDUCT Sibiromycin SO2-adduct