21753-91-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21753-91-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,5 and 3 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21753-91:
(7*2)+(6*1)+(5*7)+(4*5)+(3*3)+(2*9)+(1*1)=103
103 % 10 = 3
So 21753-91-3 is a valid CAS Registry Number.