1-amino-5-methoxy-8,9-dihydro-6H-furo[2,3-b]thiopyrano[4,3-d]pyridine-2-carbohydrazide 6H-furo[2,3-b]thiopyrano[4,3-d]pyridine-2-carboxylic acid, 1-amino-8,9-dihydro-5-methoxy-, hydrazide InChI=1/C12H14N4O3S/c1-18-11-6-4-20-3-2-5(6)7-8(13)9(10(17)16-14)19-12(7)15-11/h2-4,13-14H2,1H3,(H,16,17