21504-83-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21504-83-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,0 and 4 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21504-83:
(7*2)+(6*1)+(5*5)+(4*0)+(3*4)+(2*8)+(1*3)=76
76 % 10 = 6
So 21504-83-6 is a valid CAS Registry Number.