21655-94-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21655-94-7 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, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21655-94:
(7*2)+(6*1)+(5*6)+(4*5)+(3*5)+(2*9)+(1*4)=107
107 % 10 = 7
So 21655-94-7 is a valid CAS Registry Number.