57721-98-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 57721-98-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,7,2 and 1 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 57721-98:
(7*5)+(6*7)+(5*7)+(4*2)+(3*1)+(2*9)+(1*8)=149
149 % 10 = 9
So 57721-98-9 is a valid CAS Registry Number.