21655-77-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21655-77-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,5 and 5 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21655-77:
(7*2)+(6*1)+(5*6)+(4*5)+(3*5)+(2*7)+(1*7)=106
106 % 10 = 6
So 21655-77-6 is a valid CAS Registry Number.