21357-89-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21357-89-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,3,5 and 7 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 21357-89:
(7*2)+(6*1)+(5*3)+(4*5)+(3*7)+(2*8)+(1*9)=101
101 % 10 = 1
So 21357-89-1 is a valid CAS Registry Number.