21623-99-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21623-99-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,2 and 3 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 21623-99:
(7*2)+(6*1)+(5*6)+(4*2)+(3*3)+(2*9)+(1*9)=94
94 % 10 = 4
So 21623-99-4 is a valid CAS Registry Number.