2638-72-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 2638-72-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,6,3 and 8 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 2638-72:
(6*2)+(5*6)+(4*3)+(3*8)+(2*7)+(1*2)=94
94 % 10 = 4
So 2638-72-4 is a valid CAS Registry Number.