21769-31-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21769-31-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,6 and 9 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21769-31:
(7*2)+(6*1)+(5*7)+(4*6)+(3*9)+(2*3)+(1*1)=113
113 % 10 = 3
So 21769-31-3 is a valid CAS Registry Number.