Potassium amidosulfate reacts with formaldehyde at pH 7-12 to afford a mixt
ure of dipotassium 4-hydroxy-1,3-diazabutane-1,3-disulfonate hydrate and tr
ipotassium 6-hydroxy-1,3,5-triazahexane-1,3,5-trisulfonate HO(CH2NSO3K)(n)
. H2O (n = 2, 3). The reaction of the same compounds at pH 1-3 gives diammo
nium 1,3,5,7-tetraazabicyclo[3.3.1]nonane-3,7-disulfonic acid sulfate dihyd
rate.