21502-34-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21502-34-1 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 2 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21502-34:
(7*2)+(6*1)+(5*5)+(4*0)+(3*2)+(2*3)+(1*4)=61
61 % 10 = 1
So 21502-34-1 is a valid CAS Registry Number.