21158-13-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21158-13-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,5 and 8 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21158-13:
(7*2)+(6*1)+(5*1)+(4*5)+(3*8)+(2*1)+(1*3)=74
74 % 10 = 4
So 21158-13-4 is a valid CAS Registry Number.