1021121-20-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1021121-20-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,1,1,2 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1021121-20:
(9*1)+(8*0)+(7*2)+(6*1)+(5*1)+(4*2)+(3*1)+(2*2)+(1*0)=49
49 % 10 = 9
So 1021121-20-9 is a valid CAS Registry Number.