642427-20-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642427-20-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,4,2 and 7 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 642427-20:
(8*6)+(7*4)+(6*2)+(5*4)+(4*2)+(3*7)+(2*2)+(1*0)=141
141 % 10 = 1
So 642427-20-1 is a valid CAS Registry Number.