21744-74-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21744-74-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,4 and 4 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21744-74:
(7*2)+(6*1)+(5*7)+(4*4)+(3*4)+(2*7)+(1*4)=101
101 % 10 = 1
So 21744-74-1 is a valid CAS Registry Number.