7780-55-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7780-55-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 0 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 7780-55:
(6*7)+(5*7)+(4*8)+(3*0)+(2*5)+(1*5)=124
124 % 10 = 4
So 7780-55-4 is a valid CAS Registry Number.