20801-90-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20801-90-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,0 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 20801-90:
(7*2)+(6*0)+(5*8)+(4*0)+(3*1)+(2*9)+(1*0)=75
75 % 10 = 5
So 20801-90-5 is a valid CAS Registry Number.