21155-73-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21155-73-7 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 5 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21155-73:
(7*2)+(6*1)+(5*1)+(4*5)+(3*5)+(2*7)+(1*3)=77
77 % 10 = 7
So 21155-73-7 is a valid CAS Registry Number.