1643685-65-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1643685-65-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,4,3,6,8 and 5 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1643685-65:
(9*1)+(8*6)+(7*4)+(6*3)+(5*6)+(4*8)+(3*5)+(2*6)+(1*5)=197
197 % 10 = 7
So 1643685-65-7 is a valid CAS Registry Number.