21891-38-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21891-38-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,9 and 1 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21891-38:
(7*2)+(6*1)+(5*8)+(4*9)+(3*1)+(2*3)+(1*8)=113
113 % 10 = 3
So 21891-38-3 is a valid CAS Registry Number.