6687-53-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 6687-53-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,6,8 and 7 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 6687-53:
(6*6)+(5*6)+(4*8)+(3*7)+(2*5)+(1*3)=132
132 % 10 = 2
So 6687-53-2 is a valid CAS Registry Number.