77903-20-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77903-20-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,9,0 and 3 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 77903-20:
(7*7)+(6*7)+(5*9)+(4*0)+(3*3)+(2*2)+(1*0)=149
149 % 10 = 9
So 77903-20-9 is a valid CAS Registry Number.