InChI=1/C7H10N4O5S2/c1-16-5(13)3-2-4(12)9-6-10-11-7(17-6)18(8,14)15/h2-3H2,1H3,(H2,8,14,15)(H,9,10,12 butanoic acid, 4-[[5-(aminosulfonyl)-1,3,4-thiadiazol-2-yl]amino]-4-oxo-, methyl ester methyl 4-{[5-(aminosulfonyl)-1,3,4-thiadiazol-2-yl]amino}-4-oxobutanoate