21317-40-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21317-40-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,3,1 and 7 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21317-40:
(7*2)+(6*1)+(5*3)+(4*1)+(3*7)+(2*4)+(1*0)=68
68 % 10 = 8
So 21317-40-8 is a valid CAS Registry Number.