21561-90-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21561-90-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,6 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21561-90:
(7*2)+(6*1)+(5*5)+(4*6)+(3*1)+(2*9)+(1*0)=90
90 % 10 = 0
So 21561-90-0 is a valid CAS Registry Number.