211805-99-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 211805-99-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,1,8,0 and 5 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 211805-99:
(8*2)+(7*1)+(6*1)+(5*8)+(4*0)+(3*5)+(2*9)+(1*9)=111
111 % 10 = 1
So 211805-99-1 is a valid CAS Registry Number.