20515-30-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20515-30-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,5,1 and 5 respectively; the second part has 2 digits, 3 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 20515-30:
(7*2)+(6*0)+(5*5)+(4*1)+(3*5)+(2*3)+(1*0)=64
64 % 10 = 4
So 20515-30-4 is a valid CAS Registry Number.