42991-09-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 42991-09-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,9,9 and 1 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 42991-09:
(7*4)+(6*2)+(5*9)+(4*9)+(3*1)+(2*0)+(1*9)=133
133 % 10 = 3
So 42991-09-3 is a valid CAS Registry Number.