20999-49-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20999-49-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,9,9 and 9 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 20999-49:
(7*2)+(6*0)+(5*9)+(4*9)+(3*9)+(2*4)+(1*9)=139
139 % 10 = 9
So 20999-49-9 is a valid CAS Registry Number.