21855-28-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21855-28-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,5 and 5 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21855-28:
(7*2)+(6*1)+(5*8)+(4*5)+(3*5)+(2*2)+(1*8)=107
107 % 10 = 7
So 21855-28-7 is a valid CAS Registry Number.