7549-99-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7549-99-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,5,4 and 9 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7549-99:
(6*7)+(5*5)+(4*4)+(3*9)+(2*9)+(1*9)=137
137 % 10 = 7
So 7549-99-7 is a valid CAS Registry Number.