66628-81-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 66628-81-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,6,2 and 8 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 66628-81:
(7*6)+(6*6)+(5*6)+(4*2)+(3*8)+(2*8)+(1*1)=157
157 % 10 = 7
So 66628-81-7 is a valid CAS Registry Number.