21742-10-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21742-10-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,4 and 2 respectively; the second part has 2 digits, 1 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21742-10:
(7*2)+(6*1)+(5*7)+(4*4)+(3*2)+(2*1)+(1*0)=79
79 % 10 = 9
So 21742-10-9 is a valid CAS Registry Number.