199659-81-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 199659-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,6,5 and 9 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 199659-81:
(8*1)+(7*9)+(6*9)+(5*6)+(4*5)+(3*9)+(2*8)+(1*1)=219
219 % 10 = 9
So 199659-81-9 is a valid CAS Registry Number.