3257-28-1 Usage
Preparation
2-3, 5-two amino-methyl benzene sulfonic acid diazo, and 5-Hydroxynaphthalene-1-sulfonic acid?coupling.
Check Digit Verification of cas no
The CAS Registry Mumber 3257-28-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,2,5 and 7 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 3257-28:
(6*3)+(5*2)+(4*5)+(3*7)+(2*2)+(1*8)=81
81 % 10 = 1
So 3257-28-1 is a valid CAS Registry Number.
InChI:InChI=1/C18H16N2O7S2.2Na/c1-10-8-11(2)17(16(9-10)29(25,26)27)20-19-14-7-6-12-13(18(14)21)4-3-5-15(12)28(22,23)24;;/h3-9,20H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2*+1/p-2/b19-14-;;