17639-81-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17639-81-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,6,3 and 9 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 17639-81:
(7*1)+(6*7)+(5*6)+(4*3)+(3*9)+(2*8)+(1*1)=135
135 % 10 = 5
So 17639-81-5 is a valid CAS Registry Number.