209409-18-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 209409-18-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,9,4,0 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 209409-18:
(8*2)+(7*0)+(6*9)+(5*4)+(4*0)+(3*9)+(2*1)+(1*8)=127
127 % 10 = 7
So 209409-18-7 is a valid CAS Registry Number.