1901-42-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1901-42-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,0 and 1 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1901-42:
(6*1)+(5*9)+(4*0)+(3*1)+(2*4)+(1*2)=64
64 % 10 = 4
So 1901-42-4 is a valid CAS Registry Number.