217653-57-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 217653-57-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,6,5 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 217653-57:
(8*2)+(7*1)+(6*7)+(5*6)+(4*5)+(3*3)+(2*5)+(1*7)=141
141 % 10 = 1
So 217653-57-1 is a valid CAS Registry Number.