643744-65-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 643744-65-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,3,7,4 and 4 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 643744-65:
(8*6)+(7*4)+(6*3)+(5*7)+(4*4)+(3*4)+(2*6)+(1*5)=174
174 % 10 = 4
So 643744-65-4 is a valid CAS Registry Number.