74157-74-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 74157-74-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,1,5 and 7 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 74157-74:
(7*7)+(6*4)+(5*1)+(4*5)+(3*7)+(2*7)+(1*4)=137
137 % 10 = 7
So 74157-74-7 is a valid CAS Registry Number.