1815-21-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1815-21-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,1 and 5 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1815-21:
(6*1)+(5*8)+(4*1)+(3*5)+(2*2)+(1*1)=70
70 % 10 = 0
So 1815-21-0 is a valid CAS Registry Number.