287971-20-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 287971-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,7,9,7 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 287971-20:
(8*2)+(7*8)+(6*7)+(5*9)+(4*7)+(3*1)+(2*2)+(1*0)=194
194 % 10 = 4
So 287971-20-4 is a valid CAS Registry Number.