17820-42-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17820-42-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,8,2 and 0 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 17820-42:
(7*1)+(6*7)+(5*8)+(4*2)+(3*0)+(2*4)+(1*2)=107
107 % 10 = 7
So 17820-42-7 is a valid CAS Registry Number.