13991-90-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 13991-90-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,9,9 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 13991-90:
(7*1)+(6*3)+(5*9)+(4*9)+(3*1)+(2*9)+(1*0)=127
127 % 10 = 7
So 13991-90-7 is a valid CAS Registry Number.