74840-40-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 74840-40-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,8,4 and 0 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 74840-40:
(7*7)+(6*4)+(5*8)+(4*4)+(3*0)+(2*4)+(1*0)=137
137 % 10 = 7
So 74840-40-7 is a valid CAS Registry Number.