108251-81-6 27156-72-5 28475-18-5 51258-16-3 56274-29-4 6-Diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonic acid, polymer with formaldehyde and phenol 61970-28-3 64940-98-3 93615-64-6 Formaldehyde, polymer with phenol, 6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonate