73991-56-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 73991-56-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,9,9 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 73991-56:
(7*7)+(6*3)+(5*9)+(4*9)+(3*1)+(2*5)+(1*6)=167
167 % 10 = 7
So 73991-56-7 is a valid CAS Registry Number.