6H-furo[2,3-b]thiopyrano[4,3-d]pyridine-2-carboxylic acid, 1-amino-8,9-dihydro-5-methoxy-, ethyl ester InChI=1/C14H16N2O4S/c1-3-19-14(17)11-10(15)9-7-4-5-21-6-8(7)12(18-2)16-13(9)20-11/h3-6,15H2,1-2H ethyl 1-amino-5-methoxy-8,9-dihydro-6H-furo[2,3-b]thiopyrano[4,3-d]pyridine-2-carboxylate