99990-81-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 99990-81-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,9,9 and 0 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 99990-81:
(7*9)+(6*9)+(5*9)+(4*9)+(3*0)+(2*8)+(1*1)=215
215 % 10 = 5
So 99990-81-5 is a valid CAS Registry Number.