81688-81-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81688-81-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,8 and 8 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 81688-81:
(7*8)+(6*1)+(5*6)+(4*8)+(3*8)+(2*8)+(1*1)=165
165 % 10 = 5
So 81688-81-5 is a valid CAS Registry Number.