15998-21-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 15998-21-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,9,9 and 8 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 15998-21:
(7*1)+(6*5)+(5*9)+(4*9)+(3*8)+(2*2)+(1*1)=147
147 % 10 = 7
So 15998-21-7 is a valid CAS Registry Number.