7621-20-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7621-20-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,2 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 7621-20:
(6*7)+(5*6)+(4*2)+(3*1)+(2*2)+(1*0)=87
87 % 10 = 7
So 7621-20-7 is a valid CAS Registry Number.